Misalignment & Co.

• Verfasst von: Alonso Álvarez, Gonzalo [VerfasserIn]
• Verfasst von: Hugle, Thomas [VerfasserIn]
• Verfasst von: Jaeckel, Joerg [VerfasserIn]
• Titel: Misalignment & Co.
• Titelzusatz: (pseudo-)scalar and vector dark matter with curvature couplings
• Verf.angabe: Gonzalo Alonso-Alvarez, Thomas Hugle, Joerg Jaeckel
• E-Jahr: 2020
• Jahr: 13 February 2020
• Umfang: 25 S.
• Fussnoten: Gesehen am 03.06.2020
• Titel Quelle: Enthalten in: Journal of cosmology and astroparticle physics
• Ort Quelle: London : IOP, 2003
• Jahr Quelle: 2020
• Band/Heft Quelle: (2020,2) Artikel-Nummer 014, 25 Seiten
• ISSN Quelle: 1475-7516
• DOI: doi:10.1088/1475-7516/2020/02/014
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: axion
• Sach-SW: cosmology
• Sach-SW: dark matter theory
• Sach-SW: field
• Sach-SW: inflation
• Sach-SW: quantum field theory on curved space
• K10plus-PPN: 1699317852

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.