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Journal Club Seminars From 2019 - 2020


FALL 2019

October 4, 2019

NOTE: CASS All-Hands Meet & Greet

 CASS All-Hands Meet & Greet this Friday, October 4, from 12:00 to 1:00 pm in SERF 383. This meeting will be an opportunity for new members of CASS to introduce themselves and present a quick overview of their research. It will also give established members of CASS a chance to summarize their recent work. New graduate students are especially encouraged to attend. Pizza and soda will be provided. Journal Club is an informal environment in which graduate students can give short talks on any subject of interest to them, be it a recent paper, their own research, or any other topic. Talks will resume next week. All are welcome to attend.

October 11, 2019

 "Studying the Largest Objects in the Universe Undergoing the Largest Collisions in the Universe with the Largest (movable) Telescope on Earth"

Mark Devlin (12:00-1:00)

 Clusters of Galaxies are the largest gravitationally-bound objects in the Universe. They form via mergers with energetics that are only rivaled by the Big Bang. The study of these objects and collisions can reveal the complex processes that govern the interactions. Observations at 90 GHz with the Mustang instrument on the GBT provide high (9”) resolution of the Sunyaev-Zel’dovich effect inside the clusters. Observations with the MUSTANG instrument have unlocked a new view of these massive objects. I will also show exciting data from objects much closer to home.

October 18, 2019

 "Quantum nonfluctuations"

Eric L. Michelsen (12:00-1:00)
Physics Lecturer

October 25, 2019

NOTE: CASS Annual Sexual Harassment and Discrimination Training
@ Noon in SERF 383

 (in lieu of Journal Club)

Pizza & soda provided!

Helen Kaiser from the Office for the Prevention of Harassment & Discrimination (OPHD) will be the featured speaker. Everyone is encouraged to attend.

November 1, 2019

 "Measuring the Hubble constant from time-delays of strongly lensed quasars"

Anowar Shajib (12:00-1:00)
PhD candidate, Astronomy and Astrophysics

 The recent tension between early- and late-Universe measurements of the Hubble constant highlights the necessity for independent and precise probes such as the time-delay cosmography. The measured time-delays between the lensed images of a background quasar depend on the absolute physical scales in the lens configuration. Thus, the time-delays allow measurements of these scales to infer the Hubble constant, H_0. Due to a number of great advancements over the past decade in both the data quality and modeling techniques, the measurement of H_0 from the time-delays has fulfilled its promise to be competitive with other traditional methods such as the cosmic distance ladder. This is evident from the recent 2.4% blind measurement of H_0 from only six lenses (Wong et al. 2019). Simulation shows that a sample of nine lenses shrinks the uncertainty on this measurement to 2% (Shajib et al. 2018). I will present the Hubble constant measured from a newly analyzed lens system taking the sample size to seven. In addition, I will present the future roadmap of time-delay cosmography to independently reach 1% precision within a few years.

November 8, 2019

Dr. Patwardhan's Title: "Entanglement and collective flavor oscillations in a dense
neutrino gas"
Dr. Sen's Title: "The Dodelson-Widrow Mechanism in the presence of self-interacting

Amol Patwardhan (12:00-12:30)
N3AS Postdoctoral Fellow
UC Berkeley and University of Washington (Institute for Nuclear Theory)
Manibrata Sen (12:30-1:00)
N3AS Postdoctoral Fellow
UC Berkeley and Northwestern University

Dr. Patwardhan's Abstract: We investigate the importance of going beyond the mean-field approximation in the dynamics of collective neutrino oscillations. To expand our understanding of the coherent neutrino oscillation problem, we apply concepts from many-body physics and quantum information theory. Specifically, we use measures of nontrivial correlations (otherwise known as “entanglement”) between the constituent neutrinos of the many-body system, such as the entanglement entropy and the Bloch vector of the reduced density matrix. The relevance of going beyond the mean field is demonstrated by comparisons between the evolution of the neutrino state in the many-body picture vs the mean-field limit, for different initial conditions.

November 15, 2019

Cameron's Title: "Turbulence and Cosmic Rays Quench FIREs”

Cameron Trapp (12:00-12:30)
Physics Graduate Student

November 22, 2019

Azton Wells (12:00-12:30)
Physics Graduate Student

November 29, 2019

NOTE: Thanksgiving holiday - No Journal Club

December 6, 2019

Jen Ito (12:00-12:30)
Physics Graduate Student