PIRSA:22120017

The Irreducible Axion Background

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

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

          @misc{ pirsa_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, Berkeley

Talk number
PIRSA:22120017
Collection
Talk Type
Subject
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. 

Zoom Link:  https://pitp.zoom.us/j/99147137560?pwd=MC81d3h0OE9BZzZQcGpJakVvOFVOQT09