Cosmological gravitational particle production and its implications for cosmological relics

EW Kolb, AJ Long - Reviews of Modern Physics, 2024‏ - APS
Cosmological gravitational particle production (CGPP) is the creation of particles in an
expanding universe due solely to their gravitational interaction. These particles can play an …

Inflation: theory and observations

A Achúcarro, M Biagetti, M Braglia, G Cabass… - arxiv preprint arxiv …, 2022‏ - arxiv.org
Cosmic inflation provides a window to the highest energy densities accessible in nature, far
beyond those achievable in any realistic terrestrial experiment. Theoretical insights into the …

Classical cosmological collider physics and primordial features

X Chen, R Ebadi, S Kumar - Journal of Cosmology and …, 2022‏ - iopscience.iop.org
Features in the inflationary landscape can inject extra energies to inflation models and
produce on-shell particles with masses much larger than the Hubble scale of inflation. This …

Probing leptogenesis with the cosmological collider

Y Cui, ZZ **anyu - Physical Review Letters, 2022‏ - APS
Leptogenesis is generally challenging to directly test due to the very high energy scales
involved. In this Letter, we propose a new probe for leptogenesis with cosmological collider …

Gravitational production of completely dark photons with nonminimal couplings to gravity

C Capanelli, L Jenks, EW Kolb… - Journal of High Energy …, 2024‏ - Springer
A bstract Dark photons are a theorized massive spin-1 particle which can be produced via
various mechanisms, including cosmological gravitational particle production (GPP) in the …

Improving constraints on inflation with CMB delensing

C Trendafilova, SC Hotinli… - Journal of Cosmology and …, 2024‏ - iopscience.iop.org
The delensing of cosmic microwave background (CMB) maps will be increasingly valuable
for extracting as much information as possible from future CMB surveys. Delensing provides …

New ideas in baryogenesis: a snowmass white paper

G Elor, J Harz, S Ipek, B Shakya, N Blinov… - arxiv preprint arxiv …, 2022‏ - arxiv.org
The Standard Model of Particle Physics cannot explain the observed baryon asymmetry of
the Universe. This observation is a clear sign of new physics beyond the Standard Model …

Too Hot to Handle: Searching for Inflationary Particle Production in Planck Data

OHE Philcox, S Kumar, JC Hill - arxiv preprint arxiv:2405.03738, 2024‏ - arxiv.org
Non-adiabatic production of massive particles is a generic feature of many inflationary
mechanisms. If sufficiently massive, these particles can leave features in the cosmic …

Particle production during inflation with a nonminimally coupled spectator scalar field

Z Yu, C Fu, ZK Guo - Physical Review D, 2023‏ - APS
We study the inflationary model with a spectator scalar field χ coupled to both the inflaton
and Ricci scalar. The interaction between the χ field and the gravity, denoted by ξ R χ 2, can …

Probing cosmological particle production and pairwise hotspots with deep neural networks

T Kim, JH Kim, S Kumar, A Martin, M Münchmeyer… - Physical Review D, 2023‏ - APS
Particles with masses much larger than the inflationary Hubble scale, HI, can be pair-
produced nonadiabatically during inflation. Due to their large masses, the produced …