Audible Axions with a Booster: Stochastic Gravitational Waves from Rotating ALPs

Madge, Eric; Ratzinger, Wolfram; Schmitt, Daniel; Schwaller, Pedro

doi:10.48550/arxiv.2111.12730

Cited by 3 publications

(3 citation statements)

References 81 publications

(143 reference statements)

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“…Couplings between axions and gauge fields, in a cosmological setting, result in rich phenomenology that should be further studied and understood. Axion-gauge couplings may lead to tachyonic, non thermal enhancement of gauge modes which results in rich phenomenology in many aspects of cosmology such as inflation [108][109][110][111][112], dark matter [113][114][115], gravitational waves [116][117][118], cosmological relaxation [119][120][121][122] or dark energy [123]. On the other hand, the cosmological implications of thermal backgrounds of gauge fields have only been recently explored in a limited setting and mainly in the context of inflation and not axion dark matter (see also [121,[124][125][126] for the transition from the non-thermal to thermal regime).…”

Section: Discussionmentioning

confidence: 99%

Axion dark matter from frictional misalignment

Papageorgiou¹,

Quílez²,

Schmitz³

2022

Preprint

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We study the impact of sphaleron-induced thermal friction on the axion dark-matter abundance due to the interaction of an axion-like particle (ALP) with a dark non-abelian gauge sector in a secluded thermal bath. Thermal friction can either enhance the axion relic density by delaying the onset of oscillations or suppress it by damping them. We derive an analytical formula for the frictional adiabatic invariant, which remains constant along the axion evolution and which allows us to compute the axion relic density in a general set-up. Even in the most minimal scenario, in which a single gauge group is responsible for both the generation of the ALP mass and the friction force, we find that the resulting dark-matter abundance from the misalignment mechanism deviates from the standard scenario for axion masses m a ≳ 100 eV. We also generalize our analysis to the case where the gauge field that induces friction and the gauge sector responsible for the ALP mass are distinct and their couplings to the axion have a large hierarchy as can be justified by means of alignment or clockwork scenarios. We find that it is easy to open up the ALP parameter space where the resulting axion abundance matches the observed dark-matter relic density both in the traditionally over-and underabundant regimes. This conclusion also holds for the QCD axion.

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Section: Discussionmentioning

confidence: 99%

Axion dark matter from frictional misalignment

Papageorgiou¹,

Quílez²,

Schmitz³

2022

Preprint

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“…The enhanced Hubble rate during these phases will enhance the gravitational waves from inflation and/or cosmic strings and leave a unique triangular spectrum [789][790][791]. An additional gravitational wave signal may be generated by the rotation itself in the presence of a dark photon coupled to the axion [792,793].…”

Section: Perturbative Interaction Ratesmentioning

confidence: 99%

Early-Universe Model Building

Asadi,

Bansal,

Berlin

et al. 2022

Preprint

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“…[18]). Stochastic gravitational waves are also sourced by the produced dark photons, which predict circular polarization asymmetry of the gravitational wave background as a unique signal of this scenario [19][20][21][22][23][24][25][26]. In addition, if the dark photon mass is generated by the Higgs mechanism, the dark photons produced by the process can effectively stabilize the dark Higgs field at its origin until late times, where the hidden U(1) symmetry is restored.…”

Section: Introductionmentioning

confidence: 99%

Resonant production of dark photons from axion without a large coupling

Kitajima¹,

Takahashi²

2023

Preprint

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Dark photons could be produced resonantly by the oscillating axion field in the early universe. This resonant production mechanism has been used in various contexts, including dark photon dark matter and primordial magnetic field production. However, for this resonant production to work in an expanding universe, a large axion-dark photon coupling is required, which is not easy to realize in terms of model building and requires the introduction of many charged fermions and/or the complex clockwork mechanism. In this paper, we present a new scenario that efficiently produces dark photons from the axion with a much smaller coupling. This is possible by modifying the dynamics of axion and significantly delaying the onset of oscillations, as in the so-called trapped misalignment mechanism. As a specific example, we consider models in which dark photon production occurs efficiently despite the small axion-dark photon coupling by temporally trapping an axion in a wrong minimum and releasing it after the Hubble parameter becomes much smaller than the axion mass. In this scenario, it is expected that the polarization asymmetry of dark photons and gravitational waves generated from dark photons will be significantly reduced.

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Audible Axions with a Booster: Stochastic Gravitational Waves from Rotating ALPs

Cited by 3 publications

References 81 publications

Axion dark matter from frictional misalignment

Axion dark matter from frictional misalignment

Early-Universe Model Building

Resonant production of dark photons from axion without a large coupling

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