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X-WR-CALNAME:Physics & Astronomy
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X-WR-CALDESC:Events for Physics & Astronomy
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DTSTART;TZID=America/Chicago:20260501T130000
DTEND;TZID=America/Chicago:20260501T140000
DTSTAMP:20260610T195549
CREATED:20260219T154346Z
LAST-MODIFIED:20260219T154346Z
UID:10435394-1777640400-1777644000@uwm.edu
SUMMARY:CGCA Seminar - Shanika Galaudage
DESCRIPTION:Title and abstract to be determined\nShanika Galaudage\nNorthwestern University \nThe abstract for this talk will be added as soon as it is made available.
URL:https://uwm.edu/physics/event/cgca-seminar-shanika-galaudage/
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:20260424T130000
DTEND;TZID=America/Chicago:20260424T140000
DTSTAMP:20260610T195549
CREATED:20260130T141303Z
LAST-MODIFIED:20260424T132235Z
UID:10435385-1777035600-1777039200@uwm.edu
SUMMARY:CGCA Seminar - Matt Miles
DESCRIPTION:Galaxy-Scale Gravitational Wave Detection: The MPTA and the Road Ahead\nDr. Matt Miles\nVanderbilt University \nGravitational waves are emitted across a vast spectrum of frequencies. Ground-based detectors such as LIGO/Virgo/KAGRA observe relatively high-frequency waves from compact object mergers\, while at the other end of the spectrum\, the inspirals of supermassive black hole binaries produce a low-frequency rumble detectable only with a galaxy-scale instrument. By monitoring the pulses emitted by millisecond pulsars distributed across the Milky Way\, pulsar timing arrays construct such a detector\, spanning thousands of light-years. In recent years\, multiple pulsar timing array collaborations have reported mounting evidence for a gravitational wave background permeating the galaxy\, and the international effort to combine data across these experiments is well underway. In this talk\, I will describe how pulsar timing arrays operate\, what we have found so far — with a focus on the MeerKAT Pulsar Timing Array\, which exploits one of the world’s most sensitive radio telescopes — and the road ahead. I will also discuss new tools and techniques being developed to push the frontiers of pulsar timing\, including faster and more accessible timing software\, methods that exploit the full information content of pulse profiles rather than collapsing them to single arrival times\, and novel approaches to measuring pulsar distances using gravitational wave signals themselves.
URL:https://uwm.edu/physics/event/cgca-seminar-matt-miles/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260421T160000
DTEND;TZID=America/Chicago:20260421T173000
DTSTAMP:20260610T195549
CREATED:20260413T201616Z
LAST-MODIFIED:20260413T201616Z
UID:10435396-1776787200-1776792600@uwm.edu
SUMMARY:Physics Colloquium - Thomas D. Killeen
DESCRIPTION:Novel Imaging Techniques for Studying Interactions of Membrane Receptors Among Themselves and with Downstream Signaling Partners\nThomas D. Killeen\, PhD Candidate\nUniversity of Wisconsin-Milwaukee Department of Physics & Astronomy \nCells rely on complex signaling networks to sense and respond to environmental stimuli\, but the bigger picture of how molecular assembly leads to robust cellular signaling is only beginning to emerge.   A major challenge in characterizing cellular signaling is the ability to directly observe the dynamic interactions between membrane receptors and intracellular signaling partners in living cells.  To address this challenge\, this work presents the development of advanced fluorescence imaging and computational analysis tools designed to improve the precision and quantitative power of live-cell micro-spectroscopy for studying protein dynamics in real time. \nI will show how these tools can be used to investigate the interactions between the muscarinic acetylcholine receptor M2 (M2R) and two intracellular signaling partners\, arrestin-2 and arrestin-3\, in living cells. Quantitative imaging revealed distinct differences in arrestin recruitment and membrane association following receptor activation\, providing new insight into receptor regulation and signaling behavior. \nOverall\, this work demonstrates how innovations in fluorescence microscopy and data analysis can expand our ability to probe molecular signaling networks in living systems.
URL:https://uwm.edu/physics/event/physics-colloquium-thomas-d-killeen/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260417T130000
DTEND;TZID=America/Chicago:20260417T140000
DTSTAMP:20260610T195549
CREATED:20260130T141202Z
LAST-MODIFIED:20260130T141202Z
UID:10435384-1776430800-1776434400@uwm.edu
SUMMARY:CGCA Seminar - Janeth Valverde
DESCRIPTION:Title and abstract to be determined\nJaneth Valverde\nMarquette University \nThe abstract for this talk will be added as soon as it is made available.
URL:https://uwm.edu/physics/event/cgca-seminar-janeth-valverde/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260410T130000
DTEND;TZID=America/Chicago:20260410T140000
DTSTAMP:20260610T195549
CREATED:20260130T141047Z
LAST-MODIFIED:20260408T175232Z
UID:10435383-1775826000-1775829600@uwm.edu
SUMMARY:CGCA Seminar - Reshma Anna Thomas
DESCRIPTION:Low-Frequency Radio Transients\nReshma Anna Thomas\nNetherlands Institute for Radio Astronomy\, University of Amsterdam \nThe low-frequency radio sky (<300 MHz) remains comparatively underexplored for fast and slow transients (~ microseconds to minutes)\, primarily due to strong propagation effects as well as instrumental challenges. However\, this regime provides unique leverage on plasma environments and emission physics that are inaccessible at GHz frequencies. Fast radio bursts (FRBs) are extragalactic coherent transients with millisecond durations\, often exhibiting sub-millisecond temporal structure. I will present detections of two FRBs at 150 MHz using beamformed searches with LOFAR\, which place some of the most stringent constraints to date on free–free absorption in their local environments. In parallel\, a new class of Galactic sources\, long-period transients (LPTs)\, has recently emerged\, characterized by emission on second-to-minute durations and periodicities spanning minutes to hours. I will discuss two LPTs discovered with LOFAR interferometric imaging searches\, highlighting their phenomenology and implications for coherent emission mechanisms in their sources. These results motivate a systematic exploration of the low-frequency transient phase space. Therefore\, I will present EuroFlash\, a commensal\, real-time transient detection system for LOFAR 2.0. Operating on a dedicated compute cluster\, EuroFlash performs parallel beamforming and imaging with low latency\, enabling both discovery and localization of FRBs\, LPTs and previously unrecognized classes of radio transients across a wide range of timescales. I will summarize commissioning progress and discuss how this system opens a new region of parameter space for low-frequency radio transients.
URL:https://uwm.edu/physics/event/cgca-seminar-reshma-anna-thomas/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:CGCA Seminars
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260403T130000
DTEND;TZID=America/Chicago:20260403T140000
DTSTAMP:20260610T195549
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:20260313T130000
DTEND;TZID=America/Chicago:20260313T140000
DTSTAMP:20260610T195549
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
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260227T130000
DTEND;TZID=America/Chicago:20260227T140000
DTSTAMP:20260610T195549
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:20260220T130000
DTEND;TZID=America/Chicago:20260220T140000
DTSTAMP:20260610T195549
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:20260213T130000
DTEND;TZID=America/Chicago:20260213T140000
DTSTAMP:20260610T195549
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
X-TRIBE-STATUS:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20251212T130000
DTEND;TZID=America/Chicago:20251212T140000
DTSTAMP:20260610T195549
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:20251205T130000
DTEND;TZID=America/Chicago:20251205T140000
DTSTAMP:20260610T195549
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:20251121T130000
DTEND;TZID=America/Chicago:20251121T140000
DTSTAMP:20260610T195549
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:20251114T130000
DTEND;TZID=America/Chicago:20251114T140000
DTSTAMP:20260610T195549
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:20251107T130000
DTEND;TZID=America/Chicago:20251107T140000
DTSTAMP:20260610T195549
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:20251017T130000
DTEND;TZID=America/Chicago:20251017T140000
DTSTAMP:20260610T195549
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:20251010T130000
DTEND;TZID=America/Chicago:20251010T140000
DTSTAMP:20260610T195549
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:
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20250625T130000
DTEND;TZID=America/Chicago:20250625T143000
DTSTAMP:20260610T195549
CREATED:20250619T162939Z
LAST-MODIFIED:20250619T162939Z
UID:10435352-1750856400-1750861800@uwm.edu
SUMMARY:Physics Colloquium - Justin A. Trujillo
DESCRIPTION:Speaker: Justin A. Trujillo\, PhD Candidate – UWM Physics \nImplementing Novel Data Analysis Methods to Enhance Biophysical Studies \nStudying the structure\, motions\, and interactions of proteins as they perform their functions is greatly important in biophysics research. Time-resolved serial femtosecond crystallography (TRSFX) has been highly successful at resolving protein structures and motions. However\, TR-SFX data can be challenging to analyze. To address this\, we used a machine learning algorithm and applied it to simulated diffraction data for photoactive yellow protein (PYP). The results show that the machine learning method successfully recovers structural and dynamical information\, demonstrating that this method can be trusted for crystallography and other complex datasets. \nAnother method for studying proteins is fluorescence microscopy paired with Förster resonance energy transfer (FRET). Being highly sensitive to separation distance between fluorescent molecules\, FRET is a precise way to study protein interactions in cells. The quantity of interest in these studies is the FRET efficiency\, which measures energy transfer via FRET between fluorescent molecules. FRET efficiencies calculated from spectrally resolved data allow for the quaternary structure of proteins to be studied using a method known as FRET spectrometry. However\, due to constraints with interpreting data\, this capability has not been used with time-resolved data. In the second part of this work\, we show the results of implementing a novel method of extracting FRET efficiencies from time-resolved data. This new approach may expand FRET spectrometry to be compatible with time-resolved data. \nLocation: Kenwood IRC 2175 \nTime: 1:00PM – 2:30PM \nDate: June 25th\, 2025
URL:https://uwm.edu/physics/event/physics-colloquium-justin-a-trujillo/
LOCATION:Kenwood IRC 2175\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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