Inflection-Point Inflation with Axion Dark Matter in light of Trans-Planckian Censorship Conjecture

TL;DR

This paper proposes a gauged $B-L$ inflation model with axion dark matter consistent with the Trans-Planckian Censorship Conjecture, addressing dark matter, baryogenesis, and inflation scale constraints.

Contribution

It introduces a novel inflection-point inflation model with axion dark matter under TCC constraints, integrating seesaw and leptogenesis mechanisms.

Findings

Hubble scale during inflation is below 1 GeV, satisfying TCC.

Axion decay constant can exceed 10^{12} GeV, avoiding domain wall and isocurvature issues.

Model reproduces observed baryon asymmetry via resonant leptogenesis.

Abstract

Motivated by the recently proposed Trans-Planckian Censorship Conjecture (TCC), we propose a gauged $B-L$ model of inflection-point inflation with axion dark matter. The Hubble scale during inflation ($H_{\rm inf}$) satisfies the TCC bound of $H_{\rm inf} \lesssim 1$ GeV, the axion dark matter scenario is free from the axion domain wall and isocurvature problems, and the axion decay constant can be larger than $10^{12}$ GeV. The seesaw mechanism is automatically incorporated in the model and the observed baryon asymmetry of the universe can be reproduced via resonant leptogenesis.