Misalignment & Co.: (pseudo-)scalar and vector dark matter with curvature 
couplings

Alonso-Alvarez, Gonzalo; Hugle, Thomas; Jaeckel, Joerg

doi:10.1088/1475-7516/2020/02/014

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Misalignment & Co.: (pseudo-)scalar and vector dark matter with curvature couplings

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Hugle, Thomas
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Citation

Alonso-Alvarez, G., Hugle, T., & Jaeckel, J. (2020). Misalignment & Co.: (pseudo-)scalar and vector dark matter with curvature couplings. Journal of Cosmology and Astroparticle Physics, 2020(2): 014. doi:10.1088/1475-7516/2020/02/014.

Cite as: https://hdl.handle.net/21.11116/0000-0008-1A90-8

Abstract

Motivated by their potential role as dark matter, we study the cosmological evolution of light scalar and vector fields non-minimally coupled to gravity. Our focus is on a situation where the dominant contribution to the energy density arises from the misalignment mechanism. In addition, we also discuss the possibility that dark matter is generated in a stochastic scenario or from infationary fluctuations. Even small deviations in the non-minimal couplings from the standard scenarios lead to significant qualitative and quantitative changes. This is due to the curvature-coupling driven superhorizon evolution of the homogeneous field and the non-zero momentum modes during inflation. Both the relic density yield and the large-scale density fluctuations are affected. For the misalignment mechanism, this results in a weakening of the isocurvature constraints and opens up new viable regions of parameter space.