Post-inflationary axions: a minimal target for axion haloscopes

被引:6
|
作者
Gorghetto, Marco [1 ]
Hardy, Edward [2 ]
机构
[1] Weizmann Inst Sci, Dept Particle Phys & Astrophys, Herzl St 234, IL-761001 Rehovot, Israel
[2] Univ Liverpool, Dept Math Sci, Peach St, Liverpool L69 7ZL, England
关键词
Axions and ALPs; Early Universe Particle Physics; Particle Nature of Dark Matter; STRONG-CP PROBLEM; DOMAIN-WALLS; COSMIC STRINGS; GRAVITY; INVARIANCE; COSMOLOGY; TOPOLOGY;
D O I
10.1007/JHEP05(2023)030
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
An axion-like-particle (ALP) in the post-inflationary scenario with domain wall number N > 1 can be dark matter if the residual DOUBLE-STRUCK CAPITAL Z(N) symmetry has a small explicit breaking. Although we cannot determine the full dynamics of the system reliably, we provide evidence that such an ALP can account for the observed dark matter abundance while having a relatively small decay constant and consequently a possibly large coupling to photons. In particular, we determine the number of domain walls per Hubble patch around the time when they form using numerical simulations and combine this with analytic expectations about the subsequent dynamics. We show that the strongest constraint on the decay constant is likely to come from the dark matter ALPs being produced with large isocurvature fluctuations at small spatial scales. We also comment on the uncertainties on the dark matter small-scale structure that might form from these overdensities, in particular pointing out the importance of quantum pressure in the N = 1 case.
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页数:41
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