Lightish but clumpy: scalar dark matter from inflationary fluctuations
It has recently been shown [1] that light vector particles produced from inflationary fluctuations can give rise to the dark matter in the Universe. A similar mechanism has been discussed in [2] for a non-minimally coupled scalar enjoying a Higgs portal interaction. We discuss in detail how such a g...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
15 October 2018
|
| In: |
Journal of cosmology and astroparticle physics
Year: 2018, Issue: 10 |
| ISSN: | 1475-7516 |
| DOI: | 10.1088/1475-7516/2018/10/022 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1088/1475-7516/2018/10/022 Verlag, Volltext: http://stacks.iop.org/1475-7516/2018/i=10/a=022 
|
| Author Notes: | Gonzalo Alonso-Álvarez and Joerg Jaeckel |
| Summary: | It has recently been shown [1] that light vector particles produced from inflationary fluctuations can give rise to the dark matter in the Universe. A similar mechanism has been discussed in [2] for a non-minimally coupled scalar enjoying a Higgs portal interaction. We discuss in detail how such a generation of dark matter works in a minimal setup of a massive scalar non-minimally coupled to gravity. For suitable values of the non-minimal coupling any initial constant value of the field is suppressed during inflation. At the same time, the quantum fluctuations acquired during inflation give rise to a peaked energy density power spectrum. Isocurvature constraints can be avoided since nearly all of the energy is concentrated in fluctuations too small to be observed in the CMB. For masses ##IMG## [http://ej.iop.org/icons/Entities/gtrsim.gif] gtrsim eV and sufficiently high inflation scale the energy contained in these fluctuations is sufficient to account for the cold dark matter of the Universe. At small scales ℓ today 10 4 km √(m/eV) 10 -4 AU √(m/eV) fluctuations are large and we therefore expect a rather clumpy nature of this form of dark matter. |
|---|---|
| Item Description: | Gesehen am 03.12.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1475-7516 |
| DOI: | 10.1088/1475-7516/2018/10/022 |