Non-minimally coupled Scalar Dark Matter from Inflationary Fluctuations. (arXiv:1811.02649v1 [astro-ph.CO])

<a href="http://arxiv.org/find/astro-ph/1/au:+Alonso_Alvarez_G/0/1/0/all/0/1">Gonzalo Alonso-Álvarez</a>

It is well known that light scalar fields present during inflation are

coherently excited. We show that if the field couples to gravity in a

non-minimal way, the fluctuations at large scales are suppressed with respect

to the small scales ones. This fact allows for the field excitations to make a

sizeable contribution to the energy density of the universe without generating

too large isocurvature fluctuations at observable scales. We show that this

mechanism could generate all the observed dark matter and study the main

cosmological implications of this setup.

It is well known that light scalar fields present during inflation are

coherently excited. We show that if the field couples to gravity in a

non-minimal way, the fluctuations at large scales are suppressed with respect

to the small scales ones. This fact allows for the field excitations to make a

sizeable contribution to the energy density of the universe without generating

too large isocurvature fluctuations at observable scales. We show that this

mechanism could generate all the observed dark matter and study the main

cosmological implications of this setup.

http://arxiv.org/icons/sfx.gif