Baryogenesis from ultra-slow-roll inflation

Yi-Peng Wu (1) , Elena Pinetti , Kalliopi Petraki , Joseph Silk (2)

1 LPTHE - Laboratoire de Physique Théorique et Hautes Energies
2 IAP - Institut d'Astrophysique de Paris

The ultra-slow-roll (USR) inflation represents a class of single-field models with sharp deceleration of the rolling dynamics on small scales, leading to a significantly enhanced power spectrum of the curvature perturbations and primordial black hole (PBH) formation. Such a sharp transition of the inflationary background can trigger the coherent motion of scalar condensates with effective potentials governed by the rolling rate of the inflaton field. We show that a scalar condensate carrying (a combination of) baryon or lepton number can achieve successful baryogenesis through the Affleck-Dine mechanism from unconventional initial conditions excited by the USR transition. Viable parameter space for creating the correct baryon asymmetry of the Universe naturally incorporates the specific limit for PBHs to contribute significantly to dark matter, shedding light on the cosmic coincidence problem between the baryon and dark matter densities today.

Mots clés: Cosmology of Theories beyond the SM; Effective Field Theories; condensation: scalar; curvature: perturbation; dark matter: density; black hole: primordial; baryon: asymmetry; inflation; baryogenesis; power spectrum; inflaton; cosmic coincidence; Affleck-Dine model; trigger; coherence; lepton number; boundary condition; formation; deceleration; background; effective potential

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]; Astrophysique [astro-ph]; Physique des Hautes Energies - Théorie [hep-th]

Yi-Peng Wu, Elena Pinetti, Kalliopi Petraki, Joseph Silk. Baryogenesis from ultra-slow-roll inflation. Journal of High Energy Physics, 2022, 01 (1), pp.015. ⟨10.1007/JHEP01(2022)015⟩. ⟨hal-03339542⟩