Axion Dark Matter and Cosmological Parameters

Erken, Ozgur; Sikivie, P.; Tam, H.; Yang, Qiaoli

doi:10.1103/physrevlett.108.061304

Cited by 50 publications

(72 citation statements)

References 59 publications

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“…This subject has been mainly JHEP03(2016)013 studied for harmonic potential models that mimic the standard dark matter case [65][66][67][68][69][70][71], as it happens for the axion field [72,73]. It has been proved by using the linear perturbation theory that the axion was equivalent to CDM for high enough masses [74][75][76][77].…”

Section: Introductionmentioning

confidence: 99%

Cosmological perturbations in coherent oscillating scalar field models

Cembranos

Maroto

Jareño

2016

J. High Energ. Phys.

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The fact that fast oscillating homogeneous scalar fields behave as perfect fluids in average and their intrinsic isotropy have made these models very fruitful in cosmology. In this work we will analyse the perturbations dynamics in these theories assuming general power law potentials V (φ) = λ|φ| n /n. At leading order in the wavenumber expansion, a simple expression for the effective sound speed of perturbations is obtained c 2 eff = ω = (n − 2)/(n + 2) with ω the effective equation of state. We also obtain the first order correction in k 2 /ω 2 eff , when the wavenumber k of the perturbations is much smaller than the background oscillation frequency, ω eff . For the standard massive case we have also analysed general anharmonic contributions to the effective sound speed. These results are reached through a perturbed version of the generalized virial theorem and also studying the exact system both in the super-Hubble limit, deriving the natural ansatz for δφ; and for sub-Hubble modes, exploiting Floquet's theorem.

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Section: Introductionmentioning

confidence: 99%

Cosmological perturbations in coherent oscillating scalar field models

Cembranos

Maroto

Jareño

2016

J. High Energ. Phys.

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“…[7][8][9]) and would leave distinct imprints in direct detection experiments [10][11][12]. While many arguments have focused on the formation rate of a condensate [13][14][15][16][17][18][19], a qualitatively even more important point is the attractive nature of the relevant interactions [20,21] that tends to favor localized structures instead of a spatially constant condensate [21]. Inspired by this, it is one of our main aims to study the impact of attractive interactions and to delineate the differences to the repulsive case.…”

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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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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“…Cosmological arguments (e.g. Kolb & Turner 1994) give a lower limit on the axion mass in the range 10 −6 −10 −5 eV, with a mass of ∼10 −5 eV supplying the measured cold dark matter density (Erken et al 2011). The sun is the only astrophysical object besides SN 1987A from which neutrinos have been directly detected, and so it is natural to consider it also as a potential source of axions.…”

Section: Introductionmentioning

confidence: 99%

On the detectability of⁵⁷Fe axion-photon mode conversion in the Sun

Laming¹

2013

A&A

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Aims. The purpose of this paper is to assess the feasibility of axion detection by X-ray spectroscopy of the sun. Methods. We review the theory of axion-photon mode conversion with special attention to axions emitted in the 14.4 keV M1 decay of 57 Fe at the solar center. These then mode convert to photons in the outer layers of the solar envelope, and may in principle be detected subsequently as X-rays. Results. For axion masses above about 10 −4 eV, resonant mode conversion at a layer where the axion mass matches the local electron plasma frequency is necessary. For axion masses above about 10 −2 eV, this mode conversion occurs too deep in the solar atmosphere for the resulting photon to escape the solar surface and be detected before Compton scattering obscures the line. At the (detectable) axion masses below this, the flux of mode converted photons predicted by axion models appears to be too low for detection to be feasible with current instrumentation. Nonresonant mode conversion for axion masses below 10 −4 eV is also plausible, but with still lower predicted fluxes, since the axion coupling constant is related to its mass. Conclusions. Prospects for meaningful constraints on massive axion parameters from X-ray observations of this transition from the Sun do not appear to be promising. However parameters for massless counterparts (e.g. the "arion") may still result from such observations. It may mode convert in the outer layers of the solar atmosphere, but is not restricted by this to have a small coupling constant.

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Axion Dark Matter and Cosmological Parameters

Cited by 50 publications

References 59 publications

Cosmological perturbations in coherent oscillating scalar field models

Cosmological perturbations in coherent oscillating scalar field models

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

On the detectability of⁵⁷Fe axion-photon mode conversion in the Sun

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Axion Dark Matter and Cosmological Parameters

Cited by 50 publications

References 59 publications

Cosmological perturbations in coherent oscillating scalar field models

Cosmological perturbations in coherent oscillating scalar field models

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

On the detectability of57Fe axion-photon mode conversion in the Sun

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On the detectability of⁵⁷Fe axion-photon mode conversion in the Sun