Quark mass uncertainties revive Kim–Shifman–Vainshtein–Zakharov axion dark matter

Buckley, Matthew R.; Murayama, Hitoshi

doi:10.1088/1475-7516/2007/07/012

Cited by 7 publications

(7 citation statements)

References 52 publications

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“…3.2 we have shown that this contribution is negligible compared with the contribution of the peak located at the axion mass. We note that there is a parameter region around F a ∼ 10 6 GeV, called the "hadronic axion window" [56][57][58], that is not excluded by observations. This occurs due to the ambiguity in light quark masses which leads to the cancellation in the axion-photon coupling g aγγ for KSVZ models.…”

Section: 4mentioning

confidence: 99%

Axion cosmology with long-lived domain walls

Hiramatsu

Kawasaki

Saikawa

et al. 2013

J. Cosmol. Astropart. Phys.

156

178

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Abstract. We investigate the cosmological constraints on axion models where the domain wall number is greater than one. In these models, multiple domain walls attached to strings are formed, and they survive for a long time. Their annihilation occurs due to the effects of explicit symmetry breaking term which might be raised by Planck-scale physics. We perform three-dimensional lattice simulations and compute the spectra of axions and gravitational waves produced by long-lived domain walls. Using the numerical results, we estimated relic density of axions and gravitational waves. We find that the existence of long-lived domain walls leads to the overproduction of cold dark matter axions, while the density of gravitational waves is too small to observe at the present time. Combining the results with other observational constraints, we find that the whole parameter region of models are excluded unless an unacceptable fine-tuning exists.

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Section: 4mentioning

confidence: 99%

Axion cosmology with long-lived domain walls

Hiramatsu

Kawasaki

Saikawa

et al. 2013

J. Cosmol. Astropart. Phys.

156

178

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“…In particular, in KSVZ model, it is possible that the axion-photon coupling vanishes due to the uncertainty of the quark mass ratio m u /m d and the bound on g aγγ described above does not significantly constrain the value of F a [58][59][60]. In this case, we have to take the hadronic window into account, but it might be highly model dependent.…”

Section: Cold Axions From the Decay Of Domain Wallsmentioning

confidence: 99%

Evolution of string-wall networks and axionic domain wall problem

Hiramatsu¹,

Kawasaki²,

Saikawa³

2011

J. Cosmol. Astropart. Phys.

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We study the cosmological evolution of domain walls bounded by strings which arise naturally in axion models. If we introduce a bias in the potential, walls become metastable and finally disappear. We perform two dimensional lattice simulations of domain wall networks and estimate the decay rate of domain walls. By using the numerical results, we give a constraint for the bias parameter and the Peccei-Quinn scale. We also discuss the possibility to probe axion models by direct detection of gravitational waves produced by domain walls.

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“…Ref. [9] analyzed the issue in detail also considering the impact of the KM second-order effect in eq. (12).…”

Section: Axion Coupling To Photonsmentioning

confidence: 99%