Misalignment & Co.: (pseudo-)scalar and vector dark matter with curvature couplings
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 dis...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
13 February 2020
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| In: |
Journal of cosmology and astroparticle physics
Year: 2020, Heft: 2 |
| ISSN: | 1475-7516 |
| DOI: | 10.1088/1475-7516/2020/02/014 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/1475-7516/2020/02/014
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| Verfasserangaben: | Gonzalo Alonso-Alvarez, Thomas Hugle, Joerg Jaeckel |
| Zusammenfassung: | 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. |
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| Beschreibung: | Gesehen am 03.06.2020 |
| Beschreibung: | Online Resource |
| ISSN: | 1475-7516 |
| DOI: | 10.1088/1475-7516/2020/02/014 |