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X-WR-CALDESC:Events for Physics & Astronomy
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DTSTART;TZID=America/Chicago:20251010T130000
DTEND;TZID=America/Chicago:20251010T140000
DTSTAMP:20260610T172516
CREATED:20250925T153653Z
LAST-MODIFIED:20251006T173953Z
UID:10435362-1760101200-1760104800@uwm.edu
SUMMARY:CGCA Seminar - Hector Silva
DESCRIPTION:Prof. Hector Silva\, Assistant Professor at the Department of Physics of the University of Illinois Urbana-Champaign\nThe ringing of a different bell: quasinormal modes and their excitation beyond general relativity \nThe inference of quasinormal mode frequencies from the ringdown part of gravitational-wave signals produced by the coalescence of black hole binaries can be used to infer the mass and spin of the remnant black hole and\, possibly\, test general relativity and extensions thereof in the strong-field regime. In this seminar\, I will share some findings of a long-term project aimed at studying the quasinormal-mode spectrum of black holes beyond general relativity\, and how these modes are excited given an initial perturbation. I will interpret these findings from an effective-field-theory perspective\, and discuss some (a priori!) surprising consequences. \nThe CGCA Friday Seminar Series is hosted by the Center for Gravitation\, Cosmology & Astrophysics at the University of Wisconsin-Milwaukee. These seminars cover a broad number of topics related to the Center’s research areas. Talk titles and abstracts will be posted when available.
URL:https://uwm.edu/physics/event/cgca-seminar-hector-silva/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251015T183000
DTEND;TZID=America/Chicago:20251015T200000
DTSTAMP:20260610T172516
CREATED:20250925T182443Z
LAST-MODIFIED:20250925T182443Z
UID:10435371-1760553000-1760558400@uwm.edu
SUMMARY:CGCA Public Talk - Searching for Life in the Universe
DESCRIPTION:Searching for Life in the Universe\nPresented by Dr. Dawn Erb \nWe hope you will join us on Wednesday\, October 15 in the new Chemistry Building\, Room #108 for Dr. Dawn Erb’s presentation\, “Searching for Life in the Universe.” \nThis is a free event! Doors open at 6:30 pm with cookies and dessert bars as well as a cash bar. The program will start at 7:00 pm.  \nPlease reserve your free spot for this event. More information is available on the CGCA website. \nDue to construction\, we recommend you use the parking garage under the Lubar College of Business\, located at 3202 N. Maryland Ave. This is a full pay garage that offers ADA parking options near the entrance. You will pull a ticket to enter and pay upon exit. You will find the Chemistry Building by walking south on Maryland to the crosswalk. Head west using the crosswalk on the corner of Maryland Ave. and Kenwood Blvd. The new Chemistry Building is just a half a block\, with entrances on Kenwood Blvd. Please be sure to note the restrictions on parking signs if you choose to park on the street. \nADA parking spaces are also available in the front of the Chemistry Building. You will need to pay for parking through the MKE Park Mobile app by using code 59043 which will allow extending the parking session past the 30 minutes limit on the Chemistry circle signs. The hourly rate is $0.80/hour. \nLastly\, if you don’t wish to use a parking app\, you can call UWM Transportation Services at 414-229-4000 on the day of and pay for parking over the phone. They will collect payment via a credit/debit card. They will ask for your license plate information and email if you would like a receipt. The office is open until 4:30 pm weekdays. \nWe look forward to seeing you there!
URL:https://uwm.edu/physics/event/cgca-public-talk-searching-for-life-in-the-universe/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Leonard E Parker Center,Public Event
X-TRIBE-STATUS:
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251017T130000
DTEND;TZID=America/Chicago:20251017T140000
DTSTAMP:20260610T172516
CREATED:20250925T154334Z
LAST-MODIFIED:20251013T181702Z
UID:10435363-1760706000-1760709600@uwm.edu
SUMMARY:CGCA Seminar - Usha Raut
DESCRIPTION:Prof. Usha Raut\, Milwaukee School of Engineering\nCan LIGO be Relevant for High Energy Physics? \nThere have been spectacular advances by LIGO\, and other gravitational wave detectors in recent years. But an obvious limitation is that gravitational wave detectors currently in operation mostly deal with frequencies below 10 kHz. At the same time\, it is generally accepted that there could be very promising physics still to be discovered at higher frequency scales of the gravitational wave spectrum. This can be understood better when we consider the vast frequency ranges that have been discovered for the electromagnetic spectrum and the incredibly useful applications that have been found for high frequency x-rays and gamma rays. \nTherefore\, a major goal of this presentation is to get a dialogue started on the possibility of a LIGO expansion to high and ultra-high frequencies of the gravitational wave spectrum within a laboratory setting\, without necessarily relying on astrophysical or cosmological sources. \nThe CGCA Friday Seminar Series is hosted by the Center for Gravitation\, Cosmology & Astrophysics at the University of Wisconsin-Milwaukee. These seminars cover a broad number of topics related to the Center’s research areas. Talk titles and abstracts will be posted when available.
URL:https://uwm.edu/physics/event/cgca-seminar-usha-raut/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251024T153000
DTEND;TZID=America/Chicago:20251024T170000
DTSTAMP:20260610T172516
CREATED:20251002T142122Z
LAST-MODIFIED:20251020T211711Z
UID:10435372-1761319800-1761325200@uwm.edu
SUMMARY:Physics Colloquium - Amanda Baylor
DESCRIPTION:Early Warning of Gravitational Waves from Neutron Star Mergers\nAmanda Baylor\nGraduate Student\nUniversity of Wisconsin-Milwaukee \nFor the past decade\, ground-based gravitational-wave observatories have been making detections of ripples in the fabric of spacetime from the mergers of black holes and neutron stars. Mergers involving at least one neutron star could also produce electromagnetic counterparts which may reveal new insights into the physics of these astrophysical phenomena.  However\, if electromagnetic observatories are not pointed at the location of the source prior to merger\, we miss vital information about the physics of merger.  This presents a need for early-warning alerts\, which are alerts that are sent to observatories once a gravitational wave has been detected but before the objects collide and merge.  \nThis talk will provide an overview of gravitational-wave physics from detection to data analysis and discuss the prospects for early-warning detection of neutron star mergers.
URL:https://uwm.edu/physics/event/physics-colloquium-amanda-baylor/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251025T130000
DTEND;TZID=America/Chicago:20251025T150000
DTSTAMP:20260610T172516
CREATED:20250925T155542Z
LAST-MODIFIED:20250925T182841Z
UID:10435368-1761397200-1761404400@uwm.edu
SUMMARY:Coffeeshop Astrophysics - Nebulae: From Cradle to Grave\, and Cradle Again
DESCRIPTION:Nebulae: From Cradle to Grave\, and Cradle Again\nSpeakers: Calvin Dear\, Jason Vazquez\, Caleb Ogle \nHave you ever looked at a stunning picture from NASA full of swirling colors\, almost like it should be hanging in an art museum? Chances are\, you’re looking at a nebula. Nebulae are enormous clouds of dust and gas out in space. Some nebulae are the aftermath of a supernova\, the explosive death of a massive star. Others serve as the birthplace of many new stars\, formed by the gravitational pull of gas and radiative push of their first stars. Some nebulae even act as both. Join us as we explore nebulae and their role in star formation\, and of course\, look at many breathtaking pictures. \nMore information is available on the Coffeeshop Astrophysics website.
URL:https://uwm.edu/physics/event/coffeeshop-astrophysics-nebulae-from-cradle-to-grave-and-cradle-again/
LOCATION:Anodyne Coffee Shop\, 224 W Bruce Street\, Milwaukee\, WI\, United States
CATEGORIES:Public Event
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251031T153000
DTEND;TZID=America/Chicago:20251031T170000
DTSTAMP:20260610T172516
CREATED:20251002T142223Z
LAST-MODIFIED:20251020T211455Z
UID:10435373-1761924600-1761930000@uwm.edu
SUMMARY:Physics Colloquium - Pratyusava Baral
DESCRIPTION:Detecting & Measuring Gravitational Waves in Current and Future Observatories\nPratyusava Baral\nGraduate Student\nUniversity of Wisconsin-Milwaukee \nLow-latency (near real-time) detection of gravitational waves (GW) is crucial for multimessenger astronomy. I contribute to maintaining and operating the GstLAL-based search pipeline\, a flagship detection pipeline used by the LIGO-Virgo-KAGRA collaboration\, for the present observing run (May 2023 – ongoing). To test low-latency performance\, mock data challenges (MDC) are designed. I studied the latencies of sending out public alerts\, used to communicate with astronomers\, after a detection using the MDC. I also demonstrated the feasibility of a neural network-based algorithm that identifies the event with the best skymap for multimessenger follow-up from a set of several GW triggers in low latency. \nLooking forward to next-generation detectors such as Cosmic Explorer (CE)\, I developed the first Bayesian framework to estimate errors on inferred parameters\, incorporating effects due to Earth’s rotation and the long arm-lengths of the detectors. These effects are important for next-generation detectors and can be used to localize sources on the sky. This framework can analyze long and loud signals in ~1 day and is capable of using waveforms containing higher modes of radiation.
URL:https://uwm.edu/physics/event/physics-colloquium-pratyusava-baral/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251107T130000
DTEND;TZID=America/Chicago:20251107T140000
DTSTAMP:20260610T172516
CREATED:20250925T154451Z
LAST-MODIFIED:20250925T154451Z
UID:10435364-1762520400-1762524000@uwm.edu
SUMMARY:CGCA Seminar - Dr. Amy Steele
DESCRIPTION:Dr. Amy Steele\, Planetary Science Institute\nThe CGCA Friday Seminar Series is hosted by the Center for Gravitation\, Cosmology & Astrophysics at the University of Wisconsin-Milwaukee. These seminars cover a broad number of topics related to the Center’s research areas. Talk titles and abstracts will be posted when available.
URL:https://uwm.edu/physics/event/cgca-seminar-dr-amy-steele/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251107T153000
DTEND;TZID=America/Chicago:20251107T170000
DTSTAMP:20260610T172516
CREATED:20250919T154545Z
LAST-MODIFIED:20251105T181227Z
UID:10435353-1762529400-1762534800@uwm.edu
SUMMARY:CANCELLED: Physics Colloquium - Justin Goodrich
DESCRIPTION:Due to circumstances beyond our control\, the Physics Colloquium for Friday\, 11/7/2025 is cancelled. \nJustin Goodrich\, Brookhaven National Laboratory
URL:https://uwm.edu/physics/event/physics-colloquium-justin-goodrich/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251114T130000
DTEND;TZID=America/Chicago:20251114T140000
DTSTAMP:20260610T172516
CREATED:20250925T154637Z
LAST-MODIFIED:20251111T200515Z
UID:10435365-1763125200-1763128800@uwm.edu
SUMMARY:CGCA Seminar - Terrence Pierre Jacques
DESCRIPTION:Self-Consistent Simulations of the Bar-mode Instability in Rotating Quasi-Stable Neutron Stars\nDr. Terrence Pierre Jacques\nWest Virginia University \nRapidly rotating neutron stars (NSs) formed from core-collapse supernovae serve as excellent astrophysical laboratories for probing their equation of state (EoS) and internal structure. As these stars cool and contract\, their spin angular momentum may increase\, making them susceptible to the dynamical bar-mode instability. Once this instability sets in\, these stars experience a redistribution of matter and angular momentum\, producing gravitational waves that may be detectable by future observatories. \nIn this talk\, I will describe the numerical techniques used to model these quasi-stable NS configurations and demonstrate how gravitational wave signals produced from simulations can be used to constrain the NS EoS.
URL:https://uwm.edu/physics/event/cgca-seminar-terrence-pierre-jacques/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251114T153000
DTEND;TZID=America/Chicago:20251114T170000
DTSTAMP:20260610T172516
CREATED:20250919T154730Z
LAST-MODIFIED:20251105T181117Z
UID:10435354-1763134200-1763139600@uwm.edu
SUMMARY:CANCELLED: Physics Colloquium - Jong-Woo Kim
DESCRIPTION:Due to circumstances beyond our control\, the Physics Colloquium for Friday\, 11/14/2025 has been cancelled. \nJong-Woo Kim\, Argonne National Lab
URL:https://uwm.edu/physics/event/physics-colloquium-jong-woo-kim/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251115T130000
DTEND;TZID=America/Chicago:20251115T150000
DTSTAMP:20260610T172516
CREATED:20250925T155723Z
LAST-MODIFIED:20250925T182823Z
UID:10435369-1763211600-1763218800@uwm.edu
SUMMARY:Coffeeshop Astrophysics - Space Rocks and Stardust
DESCRIPTION:Space Rocks and Stardust\nSpeakers: Pratyasha Gitika\, Tamal RoyChowdhury\, Laila Vleeschower \nAre shooting stars really stars falling from the sky? Spoiler alert: they’re not! Those quick flashes of light are actually tiny bits of space dust and rock burning up in our atmosphere. In this talk\, we’ll take a journey through the leftovers of the formation of our Solar System: asteroids\, meteorites\, and comets. We’ll talk about how these cosmic “crumbs” sometimes light up our skies as meteor showers\, how a rock you could hold in your hand might be older than the Earth itself\, and how one very big space rock may have changed the path of life’s evolution on Earth by wiping out the dinosaurs. \nMore information is available on the Coffeeshop Astrophysics website.
URL:https://uwm.edu/physics/event/coffeeshop-astrophysics-space-rocks-and-stardust/
LOCATION:Anodyne Coffee Shop\, 224 W Bruce Street\, Milwaukee\, WI\, United States
CATEGORIES:Public Event
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251121T130000
DTEND;TZID=America/Chicago:20251121T140000
DTSTAMP:20260610T172516
CREATED:20250925T154902Z
LAST-MODIFIED:20251113T211706Z
UID:10435366-1763730000-1763733600@uwm.edu
SUMMARY:CGCA Seminar - Prof. Sharon Morsink
DESCRIPTION:The masses and radii of the neutron stars observed by NICER\nProf. Sharon Morsink\nUniversity of Alberta \nNeutron stars are the densest known gravitationally-stable objects in the Universe. Their strong gravitational fields\, rapid rotation rates\, and supra-nuclear central densities allow for a fascinating interplay between general relativistic effects and nuclear physics theory. Pulse-profile modeling is a technique that uses the gravitationally-lensed X-ray flux emitted from hot spots on the neutron star’s surface to infer its mass and radius. General relativity is a crucial ingredient in this analysis. The Neutron Star Interior Composition ExploreR (NICER) is a NASA X-ray telescope mounted on the International Space Station. NICER is a timing instrument designed to make the measurements required to implement pulse-profile modelling. In this talk\, I will give an overview of how NICER data is used to infer a neutron star’s radius (and its mass)\, along with the latest results and future observations of other pulsars.
URL:https://uwm.edu/physics/event/cgca-seminar-dr-sharon-morsink/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251121T153000
DTEND;TZID=America/Chicago:20251121T170000
DTSTAMP:20260610T172516
CREATED:20250919T154830Z
LAST-MODIFIED:20250919T154830Z
UID:10435355-1763739000-1763744400@uwm.edu
SUMMARY:Physics Colloquium - Julian May Mann
DESCRIPTION:Physics Colloquium – Julian May Mann\, Stanford University\nPresentation title and abstract will be announced when they are available.
URL:https://uwm.edu/physics/event/physics-colloquium-julian-may-mann/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251205T130000
DTEND;TZID=America/Chicago:20251205T140000
DTSTAMP:20260610T172516
CREATED:20251201T200607Z
LAST-MODIFIED:20251201T200607Z
UID:10435375-1764939600-1764943200@uwm.edu
SUMMARY:CGCA Seminar - Dr. Logan Prust
DESCRIPTION:Frame-Dragging Reveals Central Engine of a Superluminous Supernova\nDr. Logan Prust\nCenter for Computational Astrophysics – Simons Foundation \nType I superluminous supernovae (SLSNe-I) are an order of magnitude brighter than standard supernovae\, with the internal power source for their luminosity still unknown. The central engines of SLSNe-I are hypothesized to be magnetars\, but many SLSNe-I light curves exhibit multiple bumps or peaks that are unexplained by the standard magnetar model. Systematic surveys of the limited sample of SLSNe-I light curves find no compelling evidence favoring either scenario\, leaving both the nature of the light-curve fluctuations and the applicability of the magnetar model unresolved. In this talk\, I report high-cadence multiband observations of an SLSN-I with clear “chirped” light-curve bumps that can be directly linked to the properties of the magnetar central engine. Our observations are consistent with a tilted\, infalling accretion disk undergoing Lense-Thirring precession around a magnetar centrally located within the expanding supernova ejecta. Our model demonstrates that the overall light curve and bump frequency independently and self-consistently constrain the spin period and magnetic field strength of the magnetar. Our results provide the first observational evidence of frame-dragging in the environment of a magnetar and confirm the magnetar spin-down model as an explanation for the extreme luminosity observed in SLSNe-I.
URL:https://uwm.edu/physics/event/cgca-seminar-dr-logan-prust/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251205T153000
DTEND;TZID=America/Chicago:20251205T170000
DTSTAMP:20260610T172516
CREATED:20250922T163020Z
LAST-MODIFIED:20251201T162156Z
UID:10435359-1764948600-1764954000@uwm.edu
SUMMARY:Physics Colloquium - Dr. Qiuyan Chen
DESCRIPTION:Effect of Phosphorylation Barcodes on Arrestin Binding to a Chemokine Receptor\nDr. Qiuyan Chen\nAssistant Professor of Biochemistry & Molecular Biology\nIndiana University School of Medicine \nCells often fine-tune their responses to signals through chemical tags called phosphorylation ‘barcodes’ placed on receptors at the cell surface. Different G-protein coupled receptor (GPCR) kinases (GRKs) add these barcodes at different sites\, but how these patterns influence arrestins — key proteins that control receptor signaling and trafficking — has been unclear. \nIn this study\, we developed a new molecular tool (Fab7) that helps visualize how arrestin2 and arrestin3 interact with a chemokine receptor called ACKR3 when tagged by either GRK2 or GRK5. We found that GRK2 creates more flexible receptor–arrestin assemblies\, whereas GRK5 produces more stable ones. Surprisingly\, the arrestins interacted more with the surrounding membrane-like environment than with the usual docking pocket of the receptor\, and arrestin3 was more dynamic due to a missing membrane anchoring feature. These findings show that both the “barcode pattern” and the arrestin subtype can shape how GPCRs are regulated\, which may help explain differences in cellular outcomes such as how efficiently ACKR3 clears chemokines.
URL:https://uwm.edu/physics/event/physics-colloquium-dr-qiuyan-chen/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251206T130000
DTEND;TZID=America/Chicago:20251206T150000
DTSTAMP:20260610T172516
CREATED:20250925T155951Z
LAST-MODIFIED:20250925T182810Z
UID:10435370-1765026000-1765033200@uwm.edu
SUMMARY:Coffeeshop Astrophysics - What You Probably Don't Know About AI
DESCRIPTION:What You Probably Don’t Know About AI\nSpeakers: Ronan Humphrey\, Adam Opperman\, Pratyusava Baral \nOver the last century\, computing in science has changed from human computers doing calculations by hand to supercomputers that can perform over 1018 (that’s 1\,000\,000\,000\,000\,000\,000!) operations per second. This exponential growth in computing power has enabled the development of sophisticated machine learning algorithms (often referred to as artificial intelligence) capable of analyzing data\, recognizing patterns\, and making predictions in ways that were unimaginable just a few decades ago. But what even is AI\, and how do scientists utilize these evolving technologies? From computing history\, to modern environmental and ethical concerns\, join us to learn “What You Probably Don’t Know About AI”! \nMore information is available on the Coffeeshop Astrophysics website.
URL:https://uwm.edu/physics/event/coffeeshop-astrophysics-what-you-probably-dont-know-about-ai/
LOCATION:Anodyne Coffee Shop\, 224 W Bruce Street\, Milwaukee\, WI\, United States
CATEGORIES:Public Event
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251212T130000
DTEND;TZID=America/Chicago:20251212T140000
DTSTAMP:20260610T172516
CREATED:20251205T203033Z
LAST-MODIFIED:20251205T203033Z
UID:10435376-1765544400-1765548000@uwm.edu
SUMMARY:CGCA Seminar - Samuel E. Gralla
DESCRIPTION:Can black holes evaporate past extremality?\nProfessor Samuel E. Gralla\nUniversity of Arizona \nBlack holes with sufficiently large initial charge and mass will Hawking-evaporate towards the extremal limit. The emission slows as the temperature approaches zero\, but still reaches the point where a single Hawking quantum would make the object superextremal\, removing the horizon. We take this semiclassical prediction at face value and ask: When the emission occurs\, what is revealed?  Using a simple thin-shell model for the matter originally forming the black hole\, we find that this matter re-emerges after the horizon is removed and subsequently expands back to large radius.  This expanding remnant has been bathed in the ingoing Hawking quanta during evaporation and presumably carries correlations with the outgoing quanta\, offering the attractive possibility of studying information paradox issues in a setup where spacetime curvatures are globally small\, so that quantum gravity is not required. Even for ordinary black holes that evaporate down to the Planck size\, we propose a radical new scenario for the interior: rather than forming a singularity\, the collapsing matter settles onto an outgoing null trajectory inside the horizon for the entirety of evaporation.
URL:https://uwm.edu/physics/event/cgca-seminar-samuel-e-gralla/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251212T153000
DTEND;TZID=America/Chicago:20251212T170000
DTSTAMP:20260610T172516
CREATED:20251002T142428Z
LAST-MODIFIED:20251208T222245Z
UID:10435374-1765553400-1765558800@uwm.edu
SUMMARY:Physics Colloquium - Moritz Münchmeyer
DESCRIPTION:AI Reasoning in Theoretical Physics with the TPBench Project\nAssistant Professor Moritz Münchmeyer\nUW-Madison Department of Physics \nLarge-language models are becoming powerful enough to assist physicists with mathematical reasoning at the research level. In this talk\, I will first present our dataset TPBench (tpbench.org)\, which was constructed to benchmark and improve AI models specifically for theoretical physics. I will then discuss how test-time scaling and symbolic verification can be used to improve their performance and reliability. \nI will also show preliminary results from two new projects. In the first\, we apply reinforcement learning to fine-tune models on QFT problems. In the second\, we apply LLM-based code evolution (similar to Google’s AlphaEvolve) to algorithmic problems in cosmology.
URL:https://uwm.edu/physics/event/physics-colloquium-moritz-munchmeyer/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260130T153000
DTEND;TZID=America/Chicago:20260130T170000
DTSTAMP:20260610T172516
CREATED:20250919T154927Z
LAST-MODIFIED:20260120T151427Z
UID:10435356-1769787000-1769792400@uwm.edu
SUMMARY:Physics Colloquium - Chris Fragile
DESCRIPTION:What Are We Learning About Super-Eddington Accretion Disks From Simulations?\nProfessor Chris Fragile\nDepartment of Physics & Astronomy\, College of Charleston \nAccretion of gas onto black holes is one of the most important processes shaping our Universe. Understanding extremely high rates of accretion (dubbed ‘super-Eddington’) is vital to explaining the challenging observation that supermassive black holes (SMBHs) are fully formed at redshifts >7. It is also important to understanding astrophysical objects such as tidal disruption events (TDEs) and ultra-luminous X-ray sources (ULXs). \nIn this talk\, I will present the results of some recent super-Eddington disk simulations and discuss some of the interesting things we are learning.
URL:https://uwm.edu/physics/event/physics-colloquium-chris-fragile/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260206T130000
DTEND;TZID=America/Chicago:20260206T140000
DTSTAMP:20260610T172516
CREATED:20260130T135908Z
LAST-MODIFIED:20260130T135908Z
UID:10435377-1770382800-1770386400@uwm.edu
SUMMARY:CGCA Seminar - Abygail Waggoner
DESCRIPTION:What’s Feeding Terrestrial Planets? JWST Observations of Protoplanetary Disk\nDr. Abygail Waggoner\nUniversity of Wisconsin-Madison \nThe formation of terrestrial\, or earth-like\, planets is thought to occur in the inner few au of protoplanetary disks\, but what is the composition of the dust and gas that forming-planets may inherit? In this talk\, we’ll discuss how the James Webb Space Telescope can be used to measure the chemical composition of protoplanetary disk gas and how models can be used to understand the evolution of material throughout planet formation. We will focus specifically on results from the ALMA/JWST survey of Gas Evolution in PROtoplanetary disks (AGE-PRO) large collaboration (PI: Ke Zhang). AGE-PRO uses a combination of ALMA observations\, JWST observations\, and chemical disk models of thirty protoplanetary disks spanning the planet formation process (~0.5 to 6 Myr old) to gain a (relatively) comprehensive picture of gas and dust evolution of planet formation.
URL:https://uwm.edu/physics/event/cgca-seminar-abygail-waggoner/
LOCATION:KIRC KEN 2175\, 3135 N. Maryland Ave.\, Milwaukee\, 53211
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
GEO:43.0754962;-87.8839451
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC KEN 2175 3135 N. Maryland Ave. Milwaukee 53211;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260206T153000
DTEND;TZID=America/Chicago:20260206T170000
DTSTAMP:20260610T172516
CREATED:20250919T155024Z
LAST-MODIFIED:20250919T155024Z
UID:10435357-1770391800-1770397200@uwm.edu
SUMMARY:Physics Colloquium - Lulu Agazie
DESCRIPTION:Physics Colloquium – Lulu Agazie\, UWM Physics\nPresentation title and abstract will be announced when they are available.
URL:https://uwm.edu/physics/event/physics-colloquium-lulu-agazie/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260213T130000
DTEND;TZID=America/Chicago:20260213T140000
DTSTAMP:20260610T172516
CREATED:20260130T140204Z
LAST-MODIFIED:20260130T140204Z
UID:10435378-1770987600-1770991200@uwm.edu
SUMMARY:CGCA Seminar - Shio Sakon
DESCRIPTION:Detecting Gravitational Wave Signals – Methods\, Challenges\, and Opportunities\nShio Sakon\nPennsylvania State University \nThe LIGO-Virgo-KAGRA Collaboration’s fourth observing run (O4) produced a remarkable expansion of the gravitational-wave transient catalog\, with nearly three times as many significant detections as were known at the start of the run. Among these were several first-of-their-kind events that challenged existing theories\, and the increased rate of detections reflected the improvement in detector sensitivity and analysis capabilities over the past decade.   \nThis seminar will focus on the development and operation of the GstLAL matched-filter search pipeline\, which identified over 240 significant gravitational-wave candidates during O4. I will discuss the new method for constructing template banks\, sets of simulated gravitational-wave signals that form the foundation of matched-filter searches\, which improves the computational efficiency of bank generation. This approach was deployed in all O4 GstLAL production analyses\, including the subsolar-mass search\, which targets potential signatures of new physics and represents an additional area of my work. \nGravitational-wave astronomy has an exciting future ahead. With upcoming observing runs starting in mid to late this year\, future observing runs in the planning\, and next-generation detectors on the horizon\, the opportunities for discovery are rapidly expanding. Multi-messenger observations\, deeper searches\, and computationally efficient pipelines will play a central role in revealing new aspects of our Universe. I will outline the research I envision in the future observing runs with an emphasis on enabling future discoveries.
URL:https://uwm.edu/physics/event/cgca-seminar-shio-sakon/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260220T130000
DTEND;TZID=America/Chicago:20260220T140000
DTSTAMP:20260610T172516
CREATED:20260130T140441Z
LAST-MODIFIED:20260219T153957Z
UID:10435379-1771592400-1771596000@uwm.edu
SUMMARY:CGCA Seminar - Debatri Chattopadhyay
DESCRIPTION:Neutron Star–Black Hole Binaries: Predictions and Observations\nDebatri Chattopadhyay\nNorthwestern University \nNeutron star–black hole (NS–BH) binaries have emerged as key targets for multi-messenger astrophysics following the first gravitational wave detections of such systems. In this talk\, I present population synthesis predictions for the Galactic NS–BH population\, models that interpret the first observed mergers\, and forecasts for future radio\, gravitational-wave\, and electromagnetic discoveries. Using binary evolution simulations\, we predict tens – hundreds of NS–BH systems in the Milky Way\, albeit very few of which should be detectable as pulsar–black hole binaries with next-generation radio facilities and as low-frequency gravitational-wave sources. Modelling of the first NS–BH merger events indicates consistency with low-metallicity progenitors and low black hole natal spins\, implying that most mergers may produce weak or absent electromagnetic counterparts. I further show how upcoming surveys and detectors will enable joint radio and gravitational wave observations\, and how kilonova searches can constrain neutron star structure in a subset of systems. These results place NS–BH binaries in a broader context of neutron star binary evolution and highlight their role as laboratories for testing compact object formation\, binary evolution\, and multi-messenger astrophysics in the coming decade.
URL:https://uwm.edu/physics/event/cgca-seminar-debatri-chattopadhyay/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260227T130000
DTEND;TZID=America/Chicago:20260227T140000
DTSTAMP:20260610T172516
CREATED:20260130T140616Z
LAST-MODIFIED:20260225T202715Z
UID:10435380-1772197200-1772200800@uwm.edu
SUMMARY:CGCA Seminar - Kenzie Nimmo
DESCRIPTION:Unraveling the origins of fast radio bursts and using them as probes of extreme plasmas\nKenzie Nimmo\nNorthwestern University \nFast radio bursts (FRBs) are millisecond-duration flashes of coherent radio emission originating from extragalactic distances\, offering a unique view into the physics of compact objects and their surrounding environments. Despite their brief and unpredictable nature\, precise localizations of a small number of FRBs have already revealed a striking diversity in host galaxies\, local environments\, and burst properties – suggesting multiple progenitor channels linked to extreme compact objects. However\, the nature of FRB sources remains one of the most exciting mysteries in astrophysics. \nIn this talk\, I will show how combining high-precision localizations with detailed studies of FRB radio properties can disentangle their origins and probe the extreme plasma environments in which they reside. I will present new results from the now science-operational CHIME/FRB Outriggers project\, which is transforming the world’s most prolific FRB discovery instrument into a very long baseline interferometric array. The Outriggers have already approximately doubled the number of FRB host galaxies\, with many more expected in the near future. Beyond localizations\, the radio properties themselves encode key physical insights: scintillation measurements constrain the emission region to magnetospheric scales\, directly informing the emission mechanism\, while a declining electron column density over time observed in a repeating FRB points to an origin within an expanding supernova remnant. We are now entering a regime where large samples of FRBs have both detailed radio diagnostics and secure host-galaxy identifications\, enabling a far more complete understanding of the extreme astrophysical systems that power FRBs.
URL:https://uwm.edu/physics/event/cgca-seminar-kenzie-nimmo/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260227T153000
DTEND;TZID=America/Chicago:20260227T170000
DTSTAMP:20260610T172516
CREATED:20260212T193825Z
LAST-MODIFIED:20260212T193825Z
UID:10435386-1772206200-1772211600@uwm.edu
SUMMARY:Physics Colloquium - Ronan Humphrey
DESCRIPTION:Physics Colloquium – Ronan Humphrey\, UWM Physics\nPresentation title and abstract will be announced when they are available.
URL:https://uwm.edu/physics/event/physics-colloquium-ronan-humphrey/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260306T153000
DTEND;TZID=America/Chicago:20260306T170000
DTSTAMP:20260610T172516
CREATED:20260212T194044Z
LAST-MODIFIED:20260219T154625Z
UID:10435387-1772811000-1772816400@uwm.edu
SUMMARY:Physics Colloquium - Eitan Geva
DESCRIPTION:Combining Quantum Master Equations with Linearized Semiclassical Methods to Simulate Electronic Energy & Charge Transfer Dynamics in Complex Molecular Systems\nProfessor Eitan Geva\, Department of Chemistry\nUniversity of Michigan – Ann Arbor \nPhoto-induced electronic energy and charge transfer plays a key role in a variety of chemical\, biological and technologically-important molecular systems. The simulation of the\nunderlying electronic dynamics is challenging due to its intrinsically quantum mechanical nature and the large number of coupled electronic and nuclear degrees of freedom involved. Quantum master equations provide a flexible and general-purpose framework for addressing this challenge. \nIn this talk\, I will overview computational approaches for simulating photo-induced electronic energy and charge transfer dynamics in complex molecular systems that were developed and explored by my group\, which combine various types of quantum master equations with linearized semiclassical methods.
URL:https://uwm.edu/physics/event/physics-colloquium-eitan-geva/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260313T130000
DTEND;TZID=America/Chicago:20260313T140000
DTSTAMP:20260610T172516
CREATED:20260130T140719Z
LAST-MODIFIED:20260312T152211Z
UID:10435381-1773406800-1773410400@uwm.edu
SUMMARY:CGCA Seminar - León Salas
DESCRIPTION:Black Holes: Bridging Simulations and Observations\nLeón Salas\nUniversity of Wisconsin-Milwaukee \nIn recent years\, General Relativistic Magnetohydrodynamic (GRMHD) simulations\, combined with multiwavelength observations have provided critical insights into the nature of radiation from accreting black holes. These simulations have revealed a particularly interesting magnetically arrested disk (MAD) regime whereby the accretion is choked by strong magnetic fields. The higher magnetic flux characteristic of the MAD regime leads to new dynamics\, including interchange-type accretion modes and flux eruptions. Polarization measurements by the Event Horizon Telescope (EHT) from the supermassive black holes M87* and Sagittarius A* (Sgr A*) favor MAD states. However\, nearly all MAD models exhibit greater 230 GHz flux variability than seen in historical observations of Sgr A*.  \nIn this talk\, I will present my investigation on the dynamics of MAD GRMHD simulations and the (sub)millimeter variability of Sgr A* focusing on the poorly understood electron thermodynamics. In addition\, I will talk about the multiwavelength signatures of a black hole X-ray binary outburst simulation to understand how synchrotron emission from the accretion disc and jet contribute to the X-ray emission and potentially influence observables such as polarization. Finally\, I will show a library of polarized images that will be used for training PRIMO\, a machine learning–based image reconstruction code. PRIMO has enabled higher-resolution imaging of M87* using EHT data acquired in 2017\, even in the presence of sparse data coverage. We aim to extend these results by imaging polarized data from 2017 to 2025\, which are characterized by progressively improved baseline coverage\, and to provide essential groundwork for the first multi-month EHT movie campaign of M87*\, which has already started this week.
URL:https://uwm.edu/physics/event/cgca-seminar-leon-salas/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260318T143000
DTEND;TZID=America/Chicago:20260318T163000
DTSTAMP:20260610T172516
CREATED:20260317T150132Z
LAST-MODIFIED:20260317T150132Z
UID:10435395-1773844200-1773851400@uwm.edu
SUMMARY:Physics Colloquium - Adam Opperman
DESCRIPTION:Manifold-based Machine Learning for Scattering Data\nAdam Opperman\, PhD Candidate\nUniversity of Wisconsin-Milwaukee Department of Physics & Astronomy \nSmall Angle X-ray Scattering (SAXS) is a technique used to capture X-ray diffraction images of proteins in solution\, mimicking biological conditions.  These images provide insight into the overall shape and structure of the protein.   By imaging the protein system at various times during a reaction\, dubbed time-resolved SAXS (TR-SAXS)\, the evolution of the protein structure is observed.   These measurements are commonly taken at X-ray Free Electron Laser (XFEL) facilities which generate X-rays with precision and high flux.   The Compact X-ray Light Source (CXLS) and accompanying Compact X-ray Free Electron Laser (CXFEL) are under construction at Arizona State University.  Due to the compact nature of the source in combination with the yet incomplete development\, CXFEL has a reduced level of photon flux available compared to other XFELs.  Due to this constraint\, new analytical methods are needed to process TR-SAXS data. \nWe propose an application of a manifold-based machine learning technique called Non-linear Laplacian Spectral Analysis (NLSA) to address this issue.  This graph-theoretic algorithm maps data into an intrinsic subspace in which dynamic information can be extracted with high fidelity.  To verify the applicability of NLSA\, we simulated TR-SAXS data from two different protein systems: Calmodulin and Photoactive Yellow Protein.  The simulations were done within the bounds of the expected capabilities of the CXFEL.  Then\, we applied NLSA to each dataset to extract kinetic and spatial information.   We compared the results to those from Singular Value Decomposition (SVD)\, the current standard method of analysis.  We find that NLSA provides significantly more accurate and consistent structural kinetics information compared to that of SVD.   Further\, NLSA is more capable of identifying temporal trends in cases of extreme timing uncertainty.
URL:https://uwm.edu/physics/event/physics-colloquium-adam-opperman/
LOCATION:Kenwood IRC 2035\, 3135 N Maryland Ave\, Milwaukee\, 53211\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260403T130000
DTEND;TZID=America/Chicago:20260403T140000
DTSTAMP:20260610T172516
CREATED:20260130T140830Z
LAST-MODIFIED:20260401T152507Z
UID:10435382-1775221200-1775224800@uwm.edu
SUMMARY:CGCA Seminar - Tyler Trent
DESCRIPTION:Ohana Kilo Hoku: Hawaiian Culture Based Astronomy Outreach\nTyler Trent\nUniversity of Maryland \nAstronomy in Hawaii has become highly controversial in recent years\, with construction of new telescopes on Mauna Kea drawing large protests from the local communities\, especially Native Hawaiians. As someone who was born and raised on the island of Oahu in Hawaii\, and has Native Hawaiian ancestry\, I share my perspective on the conflict and present on the work of Ohana Kilo Hoku\, a Native Hawaiian non-profit organization I am a member of. Drawing inspiration from ancient Native Hawaiian’s who used the night sky to navigate the Pacific Ocean\, we work to cultivate relationships between the youth and the science of the sky above.
URL:https://uwm.edu/physics/event/cgca-seminar-tyler-trent/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260403T153000
DTEND;TZID=America/Chicago:20260403T170000
DTSTAMP:20260610T172516
CREATED:20260212T194213Z
LAST-MODIFIED:20260401T153813Z
UID:10435388-1775230200-1775235600@uwm.edu
SUMMARY:Physics Colloquium - Jong-Woo Kim
DESCRIPTION:Studying Magnetism with Resonant X-ray Scattering at Advanced Photon Source\nJong-Woo Kim\, Physicists\nMagnetic Material Group/Advanced Photon Source\, Argonne National Laboratory \nX-ray scattering at synchrotron facilities such as the Advanced Photon Source provides a powerful platform for investigating magnetic order with element and orbital specificity.  In this colloquium\, I will introduce the fundamentals of single-crystal X-ray diffraction and the principles of resonant elastic X-ray scattering (REXS)\, emphasizing how tuning to absorption edges enhances sensitivity to electronic and magnetic structures.  \nI will then discuss the microscopic origin of X-ray magnetic scattering and its unique ability to probe spin\, orbital\, and multipolar order.  Finally\, selected examples from complex oxides and correlated materials will illustrate how these techniques reveal emergent magnetic phenomena that are difficult to access with conventional probes.
URL:https://uwm.edu/physics/event/physics-colloquium-jong-woo-kim-2/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
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