PIRSA:22120017

The Irreducible Axion Background

APA

Outmezguine, N. (2022). The Irreducible Axion Background. Perimeter Institute. https://pirsa.org/22120017

MLA

Outmezguine, Nadav. The Irreducible Axion Background. Perimeter Institute, Dec. 06, 2022, https://pirsa.org/22120017

BibTex

          @misc{ pirsa_22120017,
            doi = {10.48660/22120017},
            url = {https://pirsa.org/22120017},
            author = {Outmezguine, Nadav},
            keywords = {Particle Physics},
            language = {en},
            title = {The Irreducible Axion Background},
            publisher = {Perimeter Institute},
            year = {2022},
            month = {dec},
            note = {PIRSA:22120017 see, \url{https://pirsa.org}}
          }
          

Nadav Outmezguine University of California System

Collection
Talk Type Scientific Series

Abstract

Searches for dark matter decaying into photons constrain its lifetime to be many orders of magnitude larger than the age of the Universe. A corollary statement is that the abundance of any particle that can decay into photons over cosmological timescales is constrained to be much smaller than the cold dark-matter density. We show that an irreducible freeze-in contribution to the relic density of axions is in violation of that statement in a large portion of the parameter space. This allows us to set stringent constraints on axions in the mass range 100 eV - 100 MeV. 

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