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Bose Einstein condensation of the classical axion field in cosmology?

S. Davidson 1 M. Elmer 2
2 Théorie
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : The axion is a motivated cold dark matter candidate, which it would be interesting to distinguish from weakly interacting massive particles. Sikivie has suggested that axions could behave differently during non-linear galaxy evolution, if they form a bose einstein condensate. Using classical equations of motion during linear structure formation, we explore whether "gravitational thermalisation" can drive axions to a bose einstein condensate. At linear order in G_N, we interpret that the principle activities of gravity are to expand the Universe and grow density fluctuations. From the anisotropic stress, we estimate a short dissipation scale for axions which does not confirm previous estimates of their gravitational thermalisation rate.
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Submitted on : Tuesday, September 3, 2013 - 2:09:36 PM
Last modification on : Thursday, February 6, 2020 - 4:28:10 PM

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S. Davidson, M. Elmer. Bose Einstein condensation of the classical axion field in cosmology?. Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2013, 12(2013), pp.034. ⟨10.1088/1475-7516/2013/12/034⟩. ⟨in2p3-00857367⟩



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