New Perspectives on Axion Misalignment Mechanism

Chang, Chia-Feng; Cui, Yanou

doi:10.48550/arxiv.1911.11885

Cited by 5 publications

(6 citation statements)

References 37 publications

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“…The numerical studies in Refs. [613,614] indeed confirm that at fixed values of f a the axion kinetic mechanism can produce more DM than the conventional misalignment scenario, and this opens up an interesting mass window for axion DM in the range m a ∈ [10 2 , 10 5 ] µeV.…”

Section: Dark Matter From Axion Initial Velocitymentioning

confidence: 55%

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The landscape of QCD axion models

Di Luzio,

Giannotti,

Nardi

et al. 2020

Preprint

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Section: Dark Matter From Axion Initial Velocitymentioning

confidence: 55%

“…However, given that an axion DM scenario in which this condition is realised would be genuinely different from the conventional misalignment scenario, it is worthwhile to investigate in some detail the consequences of this possibility, a task that was carried out in Refs. [613,614].…”

Section: Dark Matter From Axion Initial Velocitymentioning

confidence: 99%

The landscape of QCD axion models

Di Luzio,

Giannotti,

Nardi

et al. 2020

Preprint

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show abstract

“…Moreover, in the SU(5) GUT scenario some of the composite states acquire a parametrically suppressed mass through non-renormalizable operators interactions and can have an impact on cosmological observables which could give rise to the tantalizing opportunity of testing the GUT and PQ dynamics through celestial observations. Besides solving the strong CP problem, the QCD axion could also be the main component of DM, either through the ordinary misalignment mechanism or through a possible realization of the recently proposed kinetic misalignment mechanism [87,88] in the composite scenario. In addition, models with n f = 2 predict the existence of an additional massless scalar s. This can contribute to a component of dark radiation, which can be tested by future CMB and large-scale structure observatories, and possibly a component of DM if the UV effects generate a mass in the appropriate range.…”

Section: Discussionmentioning

confidence: 99%

Chiral models of composite axions and accidental Peccei-Quinn symmetry

Contino,

Podo,

Revello

2021

Preprint

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We introduce a class of composite axion models that provide a natural solution to the strong CP problem, and possibly account for the observed dark matter abundance.The QCD axion arises as a composite Nambu-Goldstone boson (NGB) from the dynamics of a chiral gauge theory with a strongly interacting and confining SU(N) factor and a weakly interacting U(1), with no fundamental scalar fields. The Peccei-Quinn (PQ) symmetry is accidental and all the mass scales are generated dynamically. Depending on the choices of representations and charges, the PQ symmetry can be robustly protected from higherdimensional operators up to dimension 12, providing a resolution of the axion quality problem. Our framework can be easily extended to a scenario where the Standard Model (SM) is unified in a simple gauge group, and we discuss the case of non-supersymmetric SU(5) unification. The GUT models predict the existence of additional pseudo NGBs, parametrically lighter than the GUT and PQ scales, which could have an impact on the cosmological evolution and leave observable signatures. We also clarify the selection-rules under which higher-dimensional PQ-violating operators can generate a potential for the axion in the IR, and provide a discussion of the discrete symmetries in composite axion models associated to the number of domain walls. These results can be of general interest for composite axion models based on a QCD-like confining gauge group.

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“…(2.6) which is called kination phase, as the kinetic energy of the scalar dominates. Kination can generally arise in inflation [133], quintessence, dark energy [134], and axion-like particle (ALP) models with varying power of sin-Gordon potential [135] or with a non-zero initial field velocity [136,137]. In order to retain the successful predictions of BBN theory, for all these scenarios the Universe needs to settle to RD before the BBN time T ∆ ∼ 5 MeV.…”

Section: Probing New Phases Of Cosmological Evolutionmentioning

confidence: 99%

Gravitational Waves from Global Cosmic Strings and Cosmic Archaeology

Chang,

Cui

2021

Preprint

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Global cosmic strings are predicted in many motivated extensions to the Standard Model of particle physics, with close connections to axion dark matter physics. Recent studies suggest that, although subdominant relative to Goldstone emission, gravitational wave (GW) signals from global strings can be detectable with current and planned GW detectors such as LIGO, LISA, DECIGO/BBO, ET/CE and AEDGE/AION, as well as pulsar timing arrays such as PPTA, NANOGrav and SKA. This work is an extensive, updated study on GWs from a global cosmic string network, taking into account of the most recent developments related to the subject. The main analysis is based on the analytical Velocity-dependent One-Scale (VOS) model calibrated with recent simulation results, which provides a generic protocol for such calculations with details given. We also demonstrate how the GW signal can be influenced with variations to the baseline model: this includes considering the uncertainties of model parameters and the potential deviation from the conventional VOS model prediction (i.e. the scaling behavior) as suggested by some of the recent simulation results. Furthermore, we investigated in detail the effect of a non-standard cosmology (e.g. early matter domination or kination) or new particle species on the GW signals from global strings. We demonstrate that the frequency spectrum of GW background from global cosmic strings can be used to probe the cosmic history prior to the Big Bang nucleosynthesis (BBN) (i.e. the primordial dark age) up to a temperature of T ∼ 10 8 GeV.

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New Perspectives on Axion Misalignment Mechanism

Cited by 5 publications

References 37 publications

The landscape of QCD axion models

The landscape of QCD axion models

Chiral models of composite axions and accidental Peccei-Quinn symmetry

Gravitational Waves from Global Cosmic Strings and Cosmic Archaeology

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