Phenomenology 2026 Symposium

Session

New Ideas in Baryogenesis, Inflation

11 May 2026, 14:15

University of Pittsburgh

277. Axiverse Baryogenesis

Pouya Asadi (UCSC)

11/05/2026, 14:15

New Ideas in Baryogenesis and Inflation

I will review the idea of correlating the dark matter and the baryon asymmetry abundances in a QCD dark matter model, i.e. axiogenesis. I will highlight some of the shortcomings of this idea, and propose a setup circumventing them.

391. Gravity’s Gift: Baryons from the Big Bang

Andrew Long (Rice University)

11/05/2026, 14:30

Particle Cosmology

This talk is based on a recent paper in which my collaborators and I have explored how the cosmological excess of matter over antimatter can arise through the phenomenon of cosmological gravitational particle production at the end of inflation in a Type-I Seesaw model of nonthermal leptogenesis. From a model-building standpoint, this scenario is appealing for being minimal and economical,...

336. Lingering to Inflation and the Hagedorn Phase Transition

Luis Rufino (Syracuse University)

11/05/2026, 14:45

New Ideas in Baryogenesis and Inflation

We investigate the Hagedorn regime of string theory as a possible origin for a cosmological loitering phase preceding inflation. Working with a homogeneous gravi-dilaton background coupled to an effective thermal scalar $\chi$ representing the dominant winding sector, we perform a complete phase-space analysis across three regimes of the temperature-dependent mass parameter $\mu^2$. We show...

315. Non-Gaussianity in Warm Inflation

Sagnik Mondal (Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, MD 20742, U.S.A.)

11/05/2026, 15:00

New Ideas in Baryogenesis and Inflation

Inflaton couplings to the radiation bath source inflaton fluctuations that are predominantly thermal in origin. In the context of pseudoscalar couplings, a chemical potential is induced in the bath due to non-conserved charges, which significantly modifies both the thermal friction acting on the inflaton and its associated fluctuations. In particular, the chemical potential alters the...

396. The Entangled State from a cosmological Euclidean Wormhole

Wei-Chen Lin (Ewha Womans University)

11/05/2026, 15:15

New Ideas in Baryogenesis and Inflation

We use the Euclidean path-integral method to approximate the wave function of the Universe and consider the particular scenario in which a Euclidean wormhole instanton dominates. This Euclidean wormhole solution connected to Lorentzian manifolds provides an approximation to the emergence of a classical spacetime in the quantum cosmological treatment. Beyond the background level, perturbations...

397. Stochasticity in reheating

Leia Price (MIT)

11/05/2026, 15:30

Particle Cosmology

The viability of cosmic inflation depends on an efficient reheating phase that converts the inflaton's energy into Standard Model particles. This conversion preferably proceeds through non-perturbative resonance, which is described by Hill's equation. In this talk, I’ll show how stochastic fluctuations in the parameters of Hill's equation can influence particle production during reheating....

338. The Extra-dimensional Origins of the Chemical Potential at the Cosmological Collider

Zhaohui Xu (University of Maryland, College Park)

11/05/2026, 15:45

Particle Cosmology

We study the realization of the chemical potential mechanism in cosmological collider physics in a robust model of inflation arising from multiple extra-dimensional gauge fields. We show that particles heavier than the inflationary Hubble scale can be created without suppression through minimal gauge interactions as the rolling inflaton background corresponds to an electric field in the extra...