JILA Auditorium

Note: Feel free to bring your own lunch.

Abstract: Models of rotating black holes generally possess not only an event horizon, which marks the point of no return, but also an inner horizon, beyond which lies an observable singularity and potentially a wormhole to a new universe. However, if any matter or radiation falls into the black hole, these sources of accretion will trigger an instability that may destroy the inner horizon and anything beyond.

Streaming in the JILA Auditorium from 2024 DAMOP Session Y02 Hot Topics

Abstract: We observed a narrow (~100 kHz) 229Th nuclear clock transition in Th-doped CaF2 crystals using a VUV frequency comb. The VUV comb directly links the 229Th nuclear transition frequency to the JILA Sr optical clock, enabling determination of the absolute 229Th clock frequency. These results represent a milestone in building solid-state nuclear clocks for precision measurements and fundamental physics.

Chuankun Zhang is giving a talk tomorrow at DAMOP in the “Hot Topics” session and we are going to stream it here at JILA!

Abstract:

Abstract: 

We present the development and uncertainty evaluation of a transportable ytterbium optical lattice clock, achieving a total systematic uncertainty level of 3.7 ×10^-18. We also report a field test of the clock after transporting it to Washington DC, demonstrating the clock’s reliability and readiness to contribute to scientific efforts such as the redefinition of the SI second and frequency-based measurements of Earth’s geopotential.

Abstract: The climate crisis is driving a new era of electrification around the globe.  The decarbonization of transportation and industrial processes is expected to make a significant impact on the rate of climate change.  For example, the electrification of refineries and the broader chemical industry has the potential to lead to major reductions in fossil fuel consumption and lower the production of harmful greenhouse gases contributing to climate change.  New components including electrode materials and electrolytes are being discovered quickly and are ne

Abstract: I will review some modern applications of effective field theories outside their traditional particle physics domain. In particular, I will focus on spontaneous symmetry breaking for spacetime symmetries. The effective theories for the associated Goldstone excitations capture the low-energy/long-distance dynamics of a number of physical systems, from ordinary macroscopic media (solids, fluids, superfluids, supersolids) to more exotic cosmological ones.

Abstract: Black hole X-ray binaries and Active Galactic Nuclei transition through a series of accretion states in a well-defined order. During a state transition, the accretion flow changes from a hot geometrically thick accretion flow, emitting a power-law–like hard spectrum to a geometrically thin, cool accretion flow, producing black-body–like soft spectrum.

Abstract: Ancient remnants from the early universe surround our galaxy, which you may know as globular clusters. Although now on their old age, understanding how these clusters were formed has the potential to provide insight into the physical conditions that prevailed during an epoch that cannot be directly observed. We now know that globular clusters can form during extreme episodes of star formation in the relatively nearby universe, but the actual physical conditions that give rise to globular clusters have vexed both observers and theorists for decades.