Astro Seminar Series - VIA ZOOM

Daniel Green was an undergrad at UBC and got his PhD from Stanford in 2009 under the supervision of Eva Silverstein.  After postdocs at the Institute for Advanced Study, Princeton and Stanford, he joined the faculty at CITA in 2014.  He moved to UC San Diego in 2017 where he is an Assistant Professor of Physics.  He research spans several subjects including a variety of problems in Particle Physics and Cosmology.

Talk Title and Abstract:

Signals of Light Relics in Cosmic Surveys

I will discuss recent progress understanding how light particles thermalized in the early universe can be detected in the CMB and large scale structure surveys. We will focus in particular on the phase shift of the BAO caused by free streaming of these relics prior to recombination.  We will discuss the origin of this signal in detail including the robustness to nonlinear evolution and other corrections to the phase.  Finally, we will discuss the recent measurement of the cosmic neutrino background in BOSS DR12 from this phase shift and future applications of these types of analyses.

Would you like to join this Zoom seminar?  Please email Donna Hayes.