Scalar dark matter production from preheating and structure formation constraints
| Autor: | Garcia, Marcos A. G., Pierre, Mathias, Verner, Sarunas |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
High Energy Physics - Theory
matter: power spectrum dark matter: phase space mass [dark matter] gravitation coupling GeV General Relativity and Quantum Cosmology minimal [coupling] High Energy Physics - Phenomenology (hep-ph) ultraviolet dark matter: scalar lattice temperature: reheating temperature reheating formation coupling minimal suppression back reaction High Energy Physics - Phenomenology power spectrum [matter] condensation [inflaton] infrared inflaton: condensation Astrophysics - Cosmology and Nongalactic Astrophysics Cosmology and Nongalactic Astrophysics (astro-ph.CO) Hartree approximation coupling [gravitation] interference FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics dark matter: production coupling: minimal nonperturbative matter power spectrum scalar [dark matter] gravitation: coupling ddc:530 structure phase space [dark matter] inflation distribution function dark matter production dark matter scalar relic density preheating reheating [temperature] dark matter: mass inflaton condensation dark matter phase space production [dark matter] High Energy Physics - Theory (hep-th) dark matter mass |
| Zdroj: | Physical review / D 107(4), 043530 (2023). doi:10.1103/PhysRevD.107.043530 Physical Review |
| DOI: | 10.3204/PUBDB-2022-02935 |
| Popis: | Physical review / D 107(4), 043530 (2023). doi:10.1103/PhysRevD.107.043530 We investigate the out-of-equilibrium production of scalar dark matter (DM) from the inflaton condensate during inflation and reheating. We assume that this scalar couples only to the inflaton via a direct quartic coupling and is minimally coupled to gravity. We consider all possible production regimes: purely gravitational, weak direct coupling (perturbative), and strong direct coupling (nonperturbative). For each regime, we use different approaches to determine the dark matter phase space distribution and the corresponding relic abundance. For the purely gravitational regime, scalar dark matter quanta are copiously excited during inflation resulting in an infrared (IR) dominated distribution function and a relic abundance which overcloses the universe for a reheating temperature Treh>34 GeV. A nonvanishing direct coupling induces an effective DM mass and suppresses the large IR modes in favor of ultraviolet (UV) modes and a minimal scalar abundance is generated when the interference between the direct and gravitational couplings is maximal. For large direct couplings, backreaction on the inflaton condensate is accounted for by using the Hartree approximation and lattice simulation techniques. Since scalar DM candidates can behave as noncold dark matter, we estimate the impact of such species on the matter power spectrum and derive the corresponding constraints from the Lyman-α measurements. We find that they correspond to a lower bound on the DM mass of ≳3×10-4 eV for purely gravitational production, and ≳20 eV for direct coupling production. We discuss the implications of these results. Published by Inst., Woodbury, NY |
| Databáze: | OpenAIRE |
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