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DTSTART;TZID=UTC:20250116T160000
DTEND;TZID=UTC:20250116T170000
DTSTAMP:20260525T075137
CREATED:20250109T171524Z
LAST-MODIFIED:20250109T171730Z
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SUMMARY:Speaker: Lloyd Knox (UC Davis) - Title: A Polarized Look at the Hubble Constant Problem
DESCRIPTION:Research Progress Meeting \nDate: January 16\, 2025 \nTime: 4:00- 5:00 pm \nLocation: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]  \nSpeaker: Lloyd Knox (UC Davis) \nTitle: A Polarized Look at the Hubble Constant Problem \nAbstract: The standard cosmological model has met with enormous empirical success over the past two decades. Continued testing of the model is highly warranted as it relies on additional components beyond the standard model of particle physics: the cold dark matter\, the cosmological constant\, and some mechanism for generating initial density perturbations. Additional motivation comes from a number of empirical suggestions of deficiencies in the model\, with the most statistically significant among these a mismatch between different methods for determining the current rate of the expansion of space (the Hubble constant). In this talk I will present our use of cosmic microwave background (CMB) polarization data from the third generation camera on the South Pole Telescope (SPT-3G) to provide stringent tests of the standard cosmological model and determine the Hubble constant with a standard error of 1.2% using CMB polarization data alone. \nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09\n\nMeeting ID: 988 5432 2464\n\nPasscode: 142239
URL:https://rpm.physics.lbl.gov/event/speaker-lloyd-knox-uc-davis-title-a-polarized-look-at-the-hubble-constant-problem/
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DTSTART;TZID=UTC:20250123T160000
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DTSTAMP:20260525T075137
CREATED:20250116T185456Z
LAST-MODIFIED:20250116T185534Z
UID:2742-1737648000-1737651600@rpm.physics.lbl.gov
SUMMARY:Speaker: Nicole Yunger Halpern (NIST + QuICS + University of Maryland) - Title: Quantum thermodynamics for lattice gauge theories
DESCRIPTION:Research Progress Meeting \nDate: January 23\, 2025 \nTime: 4:00- 5:00 pm \nLocation: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]  \nSpeaker: Nicole Yunger Halpern (NIST + QuICS + University of Maryland) \nTitle: Quantum thermodynamics for lattice gauge theories \nAbstract: A key objective in nuclear and high-energy physics is to describe nonequilibrium dynamics of matter\, e.g.\, in the early universe and in particle colliders\, starting from the Standard Model. Classical-computing methods\, via the framework of lattice gauge theory\, have experienced limited success in this mission. Quantum simulation of lattice gauge theories holds promise for overcoming computational limitations. Because of local constraints (Gauss’s laws)\, lattice gauge theories have an intricate Hilbert-space structure. This structure complicates the definition of thermodynamic properties of systems coupled to reservoirs during equilibrium and nonequilibrium processes. We show how to define thermodynamic quantities such as work and heat using strong-coupling thermodynamics\, a framework that has recently burgeoned within the field of quantum thermodynamics. Our definitions suit instantaneous quenches\, simple nonequilibrium processes undertaken in quantum simulators. To illustrate our framework\, we compute the work and heat exchanged during a quench in a Z2 lattice gauge theory coupled to matter in 1+1 dimensions. The thermodynamic quantities\, as functions of the quench parameter\, evidence an expected phase transition. \nReference: Davoudi\, Jarzynski\, Mueller\, Oruganti\, Powers\, and NYH\, Phys. Rev. Lett. 133\, 250402 (2024). https://journals.aps.org/prl/abstract/10.1103/ PhysRevLett.133.250402 \nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09\n\nMeeting ID: 988 5432 2464\n\nPasscode: 142239
URL:https://rpm.physics.lbl.gov/event/speaker-nicole-yunger-halpern-nist-title-quantum-thermodynamics-for-lattice-gauge-theories/
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