Past Events

Building the Microscopes of Tomorrow

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Abstract:


X-ray microscopes are undergoing a revolution, driven by the availability of laser-like X-ray beams, fast X-ray detectors, as well as image advanced algorithms. Until recently, the spatial resolution of X-ray microscopes was 10x the theoretical (diffraction) limit. This talk will highlight recent advances in building near-perfect X-ray microscopes that can see better, and moreover, stroboscopically image the fastest motions in materials in real time.

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Zoom info will be sent out in the JILA email announcement.

Exploring the Extremes of Excitonic Photophysics

When
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Abstract:My group studies the extremes of excitonic absorption and emission in condensed phase chemical/semiconductor systems. We have two primary themes: 1) The use of self-organized nanoscale systems that have controlled light absorption and energy propagation; 2) Development of molecular/inorganic materials which absorb and emit from 1-2 microns, the Short-Wavelength Infrared (SWIR). In this talk, I will discuss some of our recent research projects in the group.

Testing the Physics of Solar and Stellar Flares with Extreme UV Observations and Radiative MHD Simulations

When
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A Pretty Image from the Talk

Abstract:

Solar and stellar flares are the most intense emitters of X-rays and extreme ultraviolet radiation in planetary systems. On the Sun, strong flares are usually found in newly emerging sunspot regions. The emergence of these magnetic sunspot groups leads to the accumulation of magnetic energy in the corona.

POSTPONED to February 16: Baryogenesis, New Higgs Bosons, and What's Next

When
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Colloquia are Wednesdays at 4:40 p.m. unless otherwise noted and will be in person at DUAN G1B20, as well as online via Zoom and Youtube. If you are not a student/faculty member in physics, pre-register with Veronica Lingo (veronica.lingo@colorado.edu) to attend a lecture.

Masks are required for all colloquium attendees, regardless of vaccination status.

Statistics, Optimization and Machine Learning Seminar

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Abstract: We introduce averaged circuit eigenvalue sampling (ACES), a method for scalable noise metrology of quantum circuits that stands for Averaged Circuit Eigenvalue Sampling. It simultaneously estimates the individual error rates of all the gates in collections of quantum circuits, and can even account for space and time correlations between these gates. ACES strictly generalizes randomized benchmarking (RB), interleaved RB, simultaneous RB and several other related techniques.

Formation of a Hot Corona and Quasi-periodic Oscillations in General Relativistic MHD Simulations of Luminous Black Hole Accretion Disks

When
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Abstract:
	The gravitational pull of a black hole attracts gas and forms a
physical laboratory whose extreme conditions cannot be replicated on Earth.
The infalling gas forms an accretion disk where the interplay between
hydromagnetic processes and the warping of space-time releases
gravitational energy in the form of radiation, relativistic jets, and
winds. It is likely that most gas falls into black holes when the accretion
rate approaches the Eddington limit, at which point radiation pressure
overcomes gravity.