Events Daily

Friday, May 12, 2023

21cm Parameter Inference
Benedikt Schosser, Heidelberg University
Event Type: Informal Astro Talk
Time: 11:00 AM - 11:45 AM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: The future Square Kilometer Array (SKA) will map out the distribution of neutral hydrogen in the universe over a large range of redshifts. These future measurements can, in combination with next-generation CMB data, significantly improve the constraints on inflationary models, explicitly shown for an extension of the Starobinsky model. Additionally, the possibility of likelihood-free inference from 21cm data with machine learning is demonstrated.

Realistic Heterotic Vacua, Inflation and FIMP Dark Matter
Burt Ovrut, University of Pennsylvania
Event Type: Informal HEP Talk
Time: 2:00 PM - 3:15 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: The talk begins with a brief review of the B-L MSSM vacuum of heterotic M-theory. This theory satisfies all theoretical and phenomenological constraints required by a realistic theory of particle physics. Within this context, it is shown that an inflaton composed of a Higgs field and a sneutrino produces a successful inflationary theory in the observable sector. Aspects of this theory, including reheating are discussed. The hidden sector is then introduced, consisting of an "anomalous" U(1) line bundle with a computable number of low energy chiral matter superfields. After supersymmetry breaking, a linear combination of the dilaton and Kahler modulus remains relatively light and acts as a "moduli portal" between the observable and hidden sector. The explicit moduli interactions with both sectors are presented and shown to produce a dark matter production mechanism to the scalar fields of the hidden sector chiral matter. Within the context of this B-L MSSM theory, the dark matter "relic density" is computed and shown to be consistent with present cosmological data.

Event Type: HEP Discussion Sessions
Time: 3:30 PM - 5:30 PM
Location: 726 Broadway, 901, Sm Conf