Cosmological constraints on spontaneous R-symmetry breaking models
Yuta Hamada, Kohei Kamada, Tatsuo Kobayashi, Yutaka Ookouchi
TL;DR
This paper investigates how cosmological effects of R-axions, pseudo Nambu-Goldstone bosons from R-symmetry breaking, impose constraints on models, especially for long-lived, low-mass R-axions in the early Universe.
Contribution
It provides new cosmological constraints on spontaneous R-symmetry breaking models based on the production and effects of R-axions, especially for masses below 1 MeV.
Findings
R-axions with mass less than 1 MeV are excluded for reheating temperatures above 10 GeV.
Long-lived R-axions can cause cosmological problems, constraining model parameters.
Models with certain parameter ranges are severely limited by cosmological considerations.
Abstract
We study general constraints on spontaneous R-symmetry breaking models coming from the cosmological effects of the pseudo Nambu-Goldstone bosons, R-axions. They are substantially produced in the early Universe and may cause several cosmological problems. We focus on relatively long-lived R-axions and find that in a wide range of parameter space, models are severely constrained. In particular, R-axions with mass less than 1 MeV are generally ruled out for relatively high reheating temperature, GeV.
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