6533b834fe1ef96bd129e1d5
RESEARCH PRODUCT
Precision calculations of dark matter relic abundance
Kalle Ala-mattinenKimmo KainulainenKimmo KainulainenKimmo Kainulainensubject
Particle physicsAstrophysics and AstronomyCosmology and Nongalactic Astrophysics (astro-ph.CO)Scalar (mathematics)Dark matterFOS: Physical sciencesKinetic energykosmologia01 natural sciencesStandard ModelMomentumpimeä aineHigh Energy Physics - Phenomenology (hep-ph)WIMP0103 physical sciencesphysics of the early universeCOSMIC ABUNDANCES010306 general physicsParticle Physics - PhenomenologyPhysicsdark matter theoryAnnihilation010308 nuclear & particles physicsdark matter experimentsAstronomy and Astrophysicshep-ph115 Astronomy Space scienceHigh Energy Physics - PhenomenologyHiggs bosonastro-ph.COAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
The dark matter annihilation channels sometimes involve sharp resonances. In such cases the usual momentum averaged approximations for computing the DM abundance may not be accurate. We develop an easily accessible momentum dependent framework for computing the DM abundance accurately and efficiently near such features. We apply the method to the case of a singlet scalar dark matter $s$ interacting with SM through higgs portal $\lambda_{\rm hs}s^2 h^2$ and compare the results with different momentum averaged methods. The accuracy of the latter depend strongly on the strength of the elastic interactions and corrections are large if WIMP has negligible interactions beyond the main annihilation channel. In the singlet scalar model however, the standard model scatterings induce an efficient kinetic equilibrium that validates the momentum averaged computation to 20 per cent accuracy. We update the current extent of the allowed region in the light singlet scalar dark matter to $m_{\rm S} \in [56,62.5]$ GeV.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-12-05 |