The 3.5 keV X-ray line signal from decaying moduli with low cutoff scale

Kazunori Nakayama, Fuminobu Takahashi, Tsutomu T. Yanagida

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

The recent unidentified 3.5 keV X-ray line signal can be explained by decaying moduli dark matter with a cutoff scale one order of magnitude smaller than the Planck scale. We show that such modulus field with the low cutoff scale follows a time-dependent potential minimum and its abundance is reduced by the adiabatic suppression mechanism. As a result the modulus abundance can naturally be consistent with the observed dark matter abundance without any fine-tuning of the initial oscillation amplitude.

Original languageEnglish
Pages (from-to)338-339
Number of pages2
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume735
DOIs
Publication statusPublished - 2014 Jul 30

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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