Phenomenology 2023 Symposium

Session

Cosmology II

8 May 2023, 16:30

Lawrence Hall 207

Conveners

Cosmology II

• Joel Walker (Sam Houston State University)

134. Dynamics of Dark Matter Misalignment Through the Higgs Portal

Mudit Rai

08/05/2023, 16:30

A light singlet scalar field feebly coupled through the super-renormalizable Higgs portal provides a minimal and well-motivated realization of ultra-light bosonic dark matter. We study the cosmological production of dark matter in this model by elucidating the dynamics of two sources of scalar field misalignment generated during the radiation era. We compare our relic abundance predictions...

208. Constraints on Scalar Dark Matter Production from the Inflaton

Sarunas Verner (University of Florida)

08/05/2023, 16:45

In this talk, I discuss the production of a spectator scalar dark matter field that directly couples to the inflaton. Two specific inflationary potentials, the Starobinsky and T-model of inflation, are considered, which satisfy the constraints on the scalar tilt (n_s) and tensor-to-scalar ratio (r) as measured by the Planck satellite. Excitation of the light scalar dark matter during inflation...

164. Dark Matter Distribution in the Shapley Supercluster

Sunhaeng Hur (Virginia Tech)

08/05/2023, 17:00

We consider the possibility of constraining the dark matter distribution in the Shapley Supercluster from the velocity distribution of galaxy clusters and galaxies with in it.

78. Nonrelativistic vector dark matter nonminimally coupled to gravity

Hong-Yi Zhang

08/05/2023, 17:15

Vector dark matter (VDM) is a good candidate of dark matter with rich phenomenology. In this work, we study nonminimal couplings to gravity for VDM in the wave regime, where the particle mass is below $30\rm{eV}$. In the nonrelativistic limit, the nonminimal coupling with the lowest mass dimension leads to effective self-interactions that affect the mass-radius relation of vector solitons,...

126. Gravitataional Wave and Parity Odd Signals at the Cosmological Collider

Xuce Niu

08/05/2023, 17:30

• Introduce a Chern-Simons term that inflaton is coupled with a gauge boson and show that the gauge boson can be sufficiently produced during inflation.
• Constrain the mass and chemical potential of the gauge boson and the most stringent constraint is the non-Guassianity of the equilateral bispectrum.
• Show three signals of the gauge boson: oscillation with respect to the mass in the...

77. Baryogenesis in a Parity Solution to the Strong CP Problem

Isaac Wang

08/05/2023, 17:45

Space-time parity can solve the strong CP problem and introduces a spontaneously broken $SU(2)_R$ gauge symmetry. We investigate the possibility of baryogenesis from a first-order $SU(2)_R$ phase transition similar to electroweak baryogenesis. We consider a model with the minimal Higgs content, for which the strong CP problem is indeed solved without introducing extra symmetry beyond parity....

104. Parity-violating signals from cosmological collider

Yunjia Bao (University of Chicago)

08/05/2023, 18:00

Cosmological parity violation offers a unique way to probe the primordial non-Gaussianity. Recent studies have indicated that measuring parity-violating signals from large-scale structure observations are possible. These signals can arise naturally through the exchange of heavy spinning particles, with chemical potential enhancement, during cosmic inflation. In this talk, we will present a...