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Lightish but clumpy: scalar dark matter from inflationary fluctuations

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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...

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Hauptverfasser: Alonso Álvarez, Gonzalo (VerfasserIn) , Jaeckel, Joerg (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 15 October 2018
In: Journal of cosmology and astroparticle physics
Year: 2018, Heft: 10
ISSN:1475-7516
DOI:10.1088/1475-7516/2018/10/022
Online-Zugang: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
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Verfasserangaben:Gonzalo Alonso-Álvarez and Joerg Jaeckel

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520 |a 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. 
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