6533b834fe1ef96bd129d64a
RESEARCH PRODUCT
Dark matter from gravitational particle production at reheating
Tommi MarkkanenSami Nurmisubject
Inflation (cosmology)PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)010308 nuclear & particles physicsNuclear TheoryDark matterScalar (mathematics)FOS: Physical sciencesAstronomy and AstrophysicsDecoupling (cosmology)AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsCurvature7. Clean energy01 natural sciencesUpper and lower boundsGravitationGeneral Relativity and Quantum CosmologyHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesParticle010306 general physicsNuclear ExperimentAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
We show that curvature induced particle production at reheating generates adiabatic dark matter if there are non-minimally coupled spectator scalars weakly coupled to visible matter. The observed dark matter abundance implies an upper bound on spectator masses $m$ and non-minimal coupling values $\xi$. For example, assuming quadratic inflation, instant reheating and a single spectator scalar with only gravitational couplings, the observed dark matter abundance is obtained for $m\sim 0.1$ GeV and $\xi \sim 1$. Larger mass and coupling values of the spectator are excluded as they would lead to overproduction of dark matter.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-12-22 |