More axions from strings
Marco Gorghetto, Edward Hardy, Giovanni Villadoro
SciPost Phys. 10, 050 (2021) · published 26 February 2021
- doi: 10.21468/SciPostPhys.10.2.050
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Abstract
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.
TY - JOUR
PB - SciPost Foundation
DO - 10.21468/SciPostPhys.10.2.050
TI - More axions from strings
PY - 2021/02/26
UR - https://scipost.org/SciPostPhys.10.2.050
JF - SciPost Physics
JA - SciPost Phys.
VL - 10
IS - 2
SP - 050
A1 - Gorghetto, Marco
AU - Hardy, Edward
AU - Villadoro, Giovanni
AB - 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.
ER -@Article{10.21468/SciPostPhys.10.2.050,
title={{More axions from strings}},
author={Marco Gorghetto and Edward Hardy and Giovanni Villadoro},
journal={SciPost Phys.},
volume={10},
pages={050},
year={2021},
publisher={SciPost},
doi={10.21468/SciPostPhys.10.2.050},
url={https://scipost.org/10.21468/SciPostPhys.10.2.050},
}
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