Axion Dark Matter and Cosmological Parameters

Abstract

We observe that photon cooling after big bang nucleosynthesis (BBN) but before recombination can remove the conflict between the observed and theoretically predicted value of the primordial abundance of ${}^7$Li. Such cooling is ordinarily difficult to achieve. However, the recent realization that dark matter axions form a Bose-Einstein condensate (BEC) provides a possible mechanism, because the much colder axions may reach thermal contact with the photons. This proposal predicts a high effective number of neutrinos as measured by the cosmic microwave anisotropy spectrum.

4 pages, one figure. Version to appear in Phys. Rev. Lett., incorporating useful comments by the referees and emphasizing that photon cooling by axion BEC is a possibility, not a certainty

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• Far from equilibrium dynamics of Bose-Einstein condensation for Axion Dark Matter
• Origin of Delta N_eff as a Result of an Interaction between Dark Radiation and Dark Matter
• Cosmological solutions to the Lithium problem: Big-bang nucleosynthesis with photon cooling, $X$-particle decay and a primordial magnetic field
• Cosmological Inhomogeneities with Bose-Einstein Condensate Dark Matter
• Natural explanation for 21cm absorption signals via axion-induced cooling
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• Evolution and thermalization of dark matter axions in the condensed regime
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• Effective gravitational interactions of dark matter axions
• Solution to Big-Bang Nucleosynthesis in Hybrid Axion Dark Matter Model
• Attractive vs. repulsive interactions in the Bose-Einstein condensation dynamics of relativistic field theories
• Non-Gaussian Error Distribution of ${}^7\mathrm{Li}$ Abundance Measurements
• Constraints on Bose-Einstein-condensed Axion Dark Matter from The HI Nearby Galaxy Survey data
• Cosmology of an Axion-Like Majoron
• Dilution of dark matter relic density in singlet extension models
• A Solution to Lithium Problem by Long-Lived Stau
• A detailed exploration of the EDGES 21 cm absorption anomaly and axion-induced cooling
• Impact of Neutrino Properties and Dark Matter on the Primordial Lithium Production
• On the Detectability of 57Fe Axion-Photon Mode Conversion in the Sun
• Radiation from Axion star-Neutron star binaries with a tilted rotation axis in the presence of plasma
• Bubble Nucleation from Boson Star Collapse
• Boson dark matter halos with a dominant noncondensed component