Cosmic axions from cosmic strings

Davis, Richard L.

doi:10.1016/0370-2693(86)90300-x

Cited by 364 publications

(307 citation statements)

References 15 publications

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“…More generally, all dimensionful quantities shown in the 4 Because of the system's homogeneity, the Fourier transformation is performed with respect to the relative coordinates: Fðt; t 0 ; pÞ ¼ R d 3 Δx expð−ipΔxÞFðt; t 0 ; ΔxÞ. 5 A closely related alternative definition of the distribution function, also employed in the literature [23,28], is ðfðt; jpjÞþ 1 2 þ ð2πÞ 3 δ ð3Þ ðpÞn cond ðtÞÞ=ωðt; pÞ ¼ Fðt; t; pÞ. It turns out to yield the same distribution function, if a relativistic form for ω is employed with a suitably chosen effective mass.…”

Section: Dynamics For Single-component Model (N = 1)mentioning

confidence: 99%

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Attractive versus repulsive interactions in the Bose-Einstein condensation dynamics of relativistic field theories

et al. 2017

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We study the impact of attractive self-interactions on the nonequilibrium dynamics of relativistic quantum fields with large occupancies at low momenta. Our primary focus is on Bose-Einstein condensation and nonthermal fixed points in such systems. For a model system, we consider OðNÞ-symmetric scalar field theories. We use classical-statistical real-time simulations as well as a systematic 1=N expansion of the quantum (two-particle-irreducible) effective action to next-to-leading order. When the mean self-interactions are repulsive, condensation occurs as a consequence of a universal inverse particle cascade to the zero-momentum mode with self-similar scaling behavior. For attractive mean selfinteractions, the inverse cascade is absent, and the particle annihilation rate is enhanced compared to the repulsive case, which counteracts the formation of coherent field configurations. For N ≥ 2, the presence of a nonvanishing conserved charge can suppress number-changing processes and lead to the formation of stable localized charge clumps, i.e., Q balls.

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Section: Dynamics For Single-component Model (N = 1)mentioning

confidence: 99%

“…Important examples include the decay of coherent oscillations of the inflaton during the reheating stage after inflation [1] or the production of dark matter axions from the misalignment mechanism and from the decay of axionic strings and domain walls [2][3][4][5][6]. Therefore, understanding the dynamics of such systems is important.…”

Section: Introductionmentioning

confidence: 99%

Attractive versus repulsive interactions in the Bose-Einstein condensation dynamics of relativistic field theories

et al. 2017

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“…Axions are an often-cited cold dark matter candidate if they interact so weakly (if f a is so large) that they never achieve thermal equilibrium [23][24][25][26][27]. In that case coherent oscillations of the axion field are excited around the QCD transition when the PQ symmetry is explicitly broken by instanton effects.…”

Section: Pionic Processmentioning

confidence: 99%

A new cosmological mass limit on thermal relic axions

Hannestad

Mirizzi

Raffelt

2005

J. Cosmol. Astropart. Phys.

145

205

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Abstract. Observations of the cosmological large-scale structure provide wellestablished neutrino mass limits. We extend this argument to thermal relic axions. We calculate the axion thermal freeze-out temperature and thus their cosmological abundance on the basis of their interaction with pions. For hadronic axions we find a new mass limit m a < 1.05 eV (95% CL), corresponding to a limit on the axion decay constant of f a > 5.7 × 10 6 GeV. For other models this constraint is significantly weakened only if the axion-pion coupling is strongly suppressed. For comparison we note that the same approach leads to m ν < 0.65 eV (95% CL) for neutrinos.

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“…In the following this problem will to some extent be considered in detail. The analysis below is based on some standard references such as [19][20][21][22][23][24][25] and [56][57][58][59][60][61], where some numerical features are largely discussed.…”

Section: The Issue Of Topological Defects Formationmentioning

confidence: 99%

About the isocurvature tension between axion and high scale inflationary models

Estévez

Santillán

2016

Eur. Phys. J. C

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The present work suggests that the isocurvature tension between axion and high energy inflationary scenarios may be avoided by considering a double field inflationary model involving the hidden Peccei-Quinn Higgs and the Standard Model one. Some terms in the lagrangian we propose explicitly violate the Peccei-Quinn symmetry but, at the present era, their effect is completely negligible. The resulting mechanism allows for a large value for the axion constant, of the order f a ∼ M p , thus the axion isocurvature fluctuations are suppressed even when the scale of inflation H inf is very high, of the order of H inf ∼ M gut . This numerical value is typical in Higgs inflationary models. An analysis about topological defect formation in this scenario is also performed, and it is suggested that, under certain assumptions, their effect is not catastrophic from the cosmological point of view.

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Cosmic axions from cosmic strings

Cited by 364 publications

References 15 publications

Attractive versus repulsive interactions in the Bose-Einstein condensation dynamics of relativistic field theories

Attractive versus repulsive interactions in the Bose-Einstein condensation dynamics of relativistic field theories

A new cosmological mass limit on thermal relic axions

About the isocurvature tension between axion and high scale inflationary models

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