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More Axions from Strings

by Marco Gorghetto, Edward Hardy, Giovanni Villadoro

Submission summary

As Contributors: Giovanni Villadoro
Preprint link: scipost_202010_00013v1
Date submitted: 2020-10-15 14:40
Submitted by: Villadoro, Giovanni
Submitted to: SciPost Physics
Academic field: Physics
  • Gravitation, Cosmology and Astroparticle Physics
  • High-Energy Physics - Phenomenology
Approaches: Theoretical, Computational, Phenomenological


We study the contribution to the QCD axion dark matter abundance that is produced by string defects during the so-called scaling regime. Clear evidence of scaling violations is found, the most conservative extrapolation of which strongly suggests a large number of axions from strings. In this regime, nonlinearities at around the QCD scale are shown to play an important role in determining the final abundance. The overall result is a lower bound on the QCD axion mass in the post-inflationary scenario that is substantially stronger than the naive one from misalignment.

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Submission scipost_202010_00013v1 on 15 October 2020

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