Events
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How to Give a Talk Giving an engaging talk takes more than just knowing your material. In this talk, I’ll outline key steps for preparing and delivering a compelling presentation for a variety of audiences. We’ll explore how to understand your listeners, define the purpose of your talk, clarify your message with visuals and explanations, rehearse effectively, engage your audience, and market your talk to generate interest. These strategies will help make your presentation more impactful and enjoyable for everyone involved. |
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Spin Signatures in Horizon-Resolved Images of LLAGN With the advent of the Event Horizon Telescope (EHT), near-horizon black hole imaging with sub-mm very-long-baseline interferometry (VLBI) is now routine for the two sources for which terrestrial VLBI is sufficient to resolve the black hole shadow: Messier 87* and Sagittarius A*. Since the first images of M87*, the theoretical analysis of these images has advanced a broad class of black hole spin tracers in horizon-resolving observations, all of which have complex interplay with the astrophysical conditions near the horizon. Meanwhile, space VLBI mission concepts such as the Black Hole Explorer aim to drastically improve the angular resolution available via sub-mm VLBI, resolving out the primary accretion disk image to isolate the strongly lensed "photon ring," which more robustly exposes black hole mass, spin, and viewing inclination to distant observers.
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Light-driven Molecular Transformations Captured by Ultrafast Spectroscopy Femtosecond time-resolved spectroscopy reveals the excited-state pathways and chromophore dynamics that transform light absorption into photochemical and biological function. Using phytochromes, I will illustrate how the protein environment controls chromophore isomerization, which in turn initiates structural changes that regulate biological signaling. |
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Altermagnets: A New Technologically Relevant Class of Quantum Magnets Magnetism underpins much of our current information technology. It also derives purely from quantum mechanics. Traditionally, discussion emphasizes two classes of magnets: usual ferromagnets, which underly data storage devices, and antiferromagnets, in which magnetic moments adopt an up-down structural motif. Recently, a new class of magnets, altermagnets, has generated tremendous interest. This class mixes properties of ferromagnets and antiferromagnets in a way that is promising for future applications. |
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A Parameter Study of Eccentric Accretion Disks in GRMHD We present a three dimensional GRMHD parameter study of circularized and eccentric black hole accretion disks using the KORAL code. Our simulations span SANE and MAD magnetic flux states, black hole spins of a=0 and a=0.9, and disk eccentricities of e=0, 0.38, and 0.5. We investigate how orbital eccentricity changes disk morphology, radial inflow, magnetization, accretion variability, outflow efficiency, and disk outflow orientation. Eccentric disks develop stronger nonaxisymmetric structure and shock heated spiral features, while their radial inflow differs from circularized controls. The magnetic response depends strongly on flux state: eccentric SANE models are less magnetized and less variable, while eccentric MAD models are more magnetized and more variable. In MAD, eccentricity is also associated with larger disk and magnetized polar outflow orientation excursions.
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From Extreme Binary Stars to Self-Driving Cars Compact objects -- white dwarfs (WDs), neutron stars, and black holes -- are laboratories for studying extreme physics under conditions unable to be replicated on Earth. When located in binaries, it becomes possible to measure properties of compact objects such as magnetic field strength, temperature, and the effects of mass transfer from a companion. In this talk, I will describe recent advancements in our understanding of WD magnetism. |
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