More axions from strings

Gorghetto, Marco, Hardy, Edward ORCID: 0000-0003-3263-6575 and Villadoro, Giovanni (2021) More axions from strings. SCIPOST PHYSICS, 10 (2). 050-.

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Official URL: http://dx.doi.org/10.21468/scipostphys.10.2.050

Abstract

<jats:p>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. </jats:p>

Item Type:	Article
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	01 Mar 2021 08:59
Last Modified:	15 Mar 2024 13:35
DOI:	10.21468/SciPostPhys.10.2.050
Open Access URL:	https://scipost.org/10.21468/SciPostPhys.10.2.050/...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3116275