The Mitchell Conference on Collider, Dark Matter, and Neutrino Physics 2023

Session

Cosmology

May 16, 2023, 9:30 AM

Hawking Auditorium (Texas A&M University)

Conveners

Cosmology

• Kaustubh Agashe

Cosmology

• Keith Dienes (University of Arizona)

6. Parity solution to the strong CP problem and leptogenesis

Rabindra Mohapatra

5/16/23, 9:30 AM

I discuss parity solutions to the strong CP problem which do not need an axion. It is implemented within the context of left-right symmetric models with minimal Higgs content and the universal seesaw mechanism using vector like fermions to generate quark and lepton masses. I discuss a way to understand the origin of matter-anti-matter asymmetry in these models using Affleck-Dine (AD)...

13. Leptogenesis triggered by a first-order phase transition

Peisi Huang

5/16/23, 9:55 AM

In this talk, I will present a new scenario of leptogenesis, which is triggered by a first-order phase transition (FOPT). The right-handed neutrinos (RHNs) are massless in the old vacuum, while they acquire a mass in the new vacuum bubbles, and the mass gap is huge compared with the FOPT temperature. The ultra-relativistic bubble walls sweep the RHNs into the bubbles, where the RHNs experience...

22. Probing the Early Universe with Dark Matter Annihilation

Adrienne Erickcek

5/16/23, 10:20 AM

As remnants of the earliest stages of structure formation, the smallest dark matter halos provide a unique probe of the evolution of the Universe prior to the onset of Big Bang nucleosynthesis (BBN). I will discuss how the pre-BBN expansion history can enhance the microhalo population, thereby boosting the dark matter annihilation rate if dark matter is a thermal relic. The amplitude of this...

52. Stasis in an Expanding Universe: Overview, Concrete Realizations, and Observational Consequences

Brooks Thomas

5/19/23, 11:15 AM

2. Dark Matter and Baryogenesis from Long-Lived Particles in the Visible Sector

Rouzbeh Allahverdi (University of New Mexico)

5/19/23, 11:40 AM

A minimal extension of the standard model is presented that includes a long-lived fermion with weak-scale mass and an O(GeV) fermionic dark matter candidate. Decays of a TeV-scale colored scalar in a radiation-dominated phase bring the former to a thermal abundance while also producing dark matter. The long-lived fermion then drives a period of early matter domination and decays to reheat the...

42. Parity solution to the strong CP problem and leptogenesis

51. TBA

Keith Dienes (University of Arizona)