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Astrophysics Seminars From 2020 - 2021


Fall 2020

September 30, 2020

NOTE: No seminar today

October 7, 2020

 CASS-SDSU Seminar welcome event led by George Fuller/Eric Sandquist

Zoom link

 Zoom password: cass-sdsu

October 14, 2020

 "WIMP Dark Matter In An Unusual Cosmological History"

Seyda Ipek
UC President's Postdoctoral Fellow
UC Irvine

 Or iPhone one-tap :
US: +16699006833,,98208404473# or +12133388477,,98208404473#
Or Telephone:
Dial(for higher quality, dial a number based on your current location):
US: +1 669 900 6833 or +1 213 338 8477 or +1 669 219 2599 or 888 475 4499 (Toll Free) or 833 548 0276 (Toll Free) or 833 548 0282 (Toll Free) or 877 853 5257 (Toll Free)
Webinar ID: 982 0840 4473
International numbers available:

ABSTRACT: WIMP miracle has been an important paradigm in the search for dark matter. However the WIMP parameter space is under great tension from direct detection experiments. I will give you a WIMP scenario with an alternative cosmological history of our universe where the quarks confined into mesons at an earlier stage compared to the standard cosmology with the Standard Model. This alternate scenario will open up WIMP parameter space that is not excluded by dark matter experiments.

October 21, 2020

 "A Glimpse Below the Lyman Limit: New observational advances on the escape of ionizing photons from local galaxies"

John Chisholm
UT Austin

 Or iPhone one-tap :
US: +16699006833,,98688518404# or +12133388477,,98688518404#
Or Telephone:
Dial(for higher quality, dial a number based on your current location):
US: +1 669 900 6833 or +1 213 338 8477 or +1 669 219 2599 or 833 548 0276 (Toll Free) or 833 548 0282 (Toll Free) or 877 853 5257 (Toll Free) or 888 475 4499 (Toll Free)
Webinar ID: 986 8851 8404
International numbers available:

ABSTRACT: The neutral gas between galaxies was rapidly reionized at redshifts between 6-10. The origin of these ionizing photons remains elusive, but fundamentally shapes the subsequent evolution of the galaxies and the formation of large-scale structure in the universe. The key to unraveling the epoch of reionization is an understanding of both the sources emit ionizing photons (stars vs. active galactic nuclei) and how these ionizing photons escape galaxies. I will present an overview of the recent observational advances that have led to the discovery of local star-forming galaxies that emit ionizing photons, including a recent large Hubble Space Telescope survey that has more than doubled the known number of emitters of ionizing photons. A statistical sample allows for the first detailed look into what types of star-forming galaxies emit ionizing photons and how those ionizing photons can escape star-forming galaxies. I will focus on new probes from the rest-frame ultraviolet that promise to diagnose the porosity of the neutral medium within galaxies at high-redshift. These local surveys set the stage for upcoming telescopes to determine the impact of star-forming galaxies on Cosmic Reionization.

October 28, 2020

 "Inference can constrain a model of neutrino flavor transformation in core-collapse supernovaeā€

Eve Armstrong
Assistant Professor, Department of Physics
New York Institute of Technology

November 4, 2020

NOTE: No seminar today

November 11, 2020

NOTE: No seminar today: Veteran's Day Holiday

November 18, 2020

 "Solar System Archaelogy: Multidisciplinary Approaches to Understanding Planetary System Formation"

Gerardo Dominguez
Associate Professor, Physics
CSU San Marcos

 ABSTRACT: Astronomical observations by the Kepler space telescope have confirmed, to date, the existence of over 3,000 planetary systems in our Galactic neighborhood. The distributions of planet size, compositions, and orbital parameters derived from these observations pose a fundamental challenge for models of planetary system formation which currently do not provide an explanation for why some molecular cloud regions collapse to form planetary systems that are rich in terrestrial planets, water, and possibly life while others do not. Historically, our understanding of planetary system formation has relied on astronomical observations of our Solar System. Much less appreciated, however, is the role that that the analysis of planetary materials (i.e. meteorites, cometary dust, and solar wind particles) has played in this understanding. In this talk, I will review how observations of our solar system at the chemical and isotopic level provided us with tight constraints on planetary system formation and the origins of water on terrestrial planets like our own. Incorporating these observations into comprehensive models, I argue, will require combining theoretical and laboratory studies of astrochemical processes that occur in molecular clouds and protoplanetary disks. To illustrate, I will highlight the recent accomplishments made by my research group and collaborators in understanding astrochemical processes with high precision chemical and isotopic resolutions. I conclude by highlighting recent advances in laboratory astrophysical measurement technology including the measurement of radiation induced isotope exchange between water ice and silicate surfaces at 10K, the direct measurement of the optical properties of individual dust grains from the Stardust mission in the laboratory using NanoIR, and the development of planetary exploration instrumentation for the in-situ determinations of the isotopic compositions of lunar ice. I will conclude by discussing how these studies may help us understand the origins of the planets and water in the solar system.

November 25, 2020

NOTE: No seminar today

December 2, 2020

Gina Panopoulou
NASA Hubble Fellow

December 9, 2020

Michael McElwain
JWST Project Scientist
NASA Goddard Space Flight Center

December 16, 2020

NOTE: No seminar today

Winter 2021

January 6, 2021

Matthew Povich
Associate Professor, Department of Physics and Astronomy
Cal Poly Pomona

January 13, 2021

January 20, 2021

January 27, 2021

February 3, 2021

February 10, 2021

February 17, 2021

February 24, 2021

March 3, 2021

March 10, 2021

March 17, 2021

Spring 2021

March 24, 2021

March 31, 2021

April 7, 2021

April 14, 2021

April 21, 2021

April 28, 2021

May 5, 2021

May 12, 2021

May 19, 2021

May 26, 2021

June 2, 2021

June 9, 2021