2019/02/15 by Changhong Li, Li, Changhong
Physics and Astronomy · #Astrophysics #Cosmic background radiation #Cosmic microwave background #Cosmological perturbation theory #Cosmology #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #Dark Matter and Cosmic Phenomena #Dark matter #FOS: Physical sciences #Mathematical physics #Particle physics theoretical and experimental studies #Perturbation (astronomy) #Physics #Quantum electrodynamics #Quantum mechanics
paper · pdf · doi:10.48550/arxiv.1902.05738
openalex publication_date 2019/02/15 · openalex created_date 2020/03/27 · openalex updated_date 2026/07/28
To trace the particle nature of dark matter (DM) from cosmic microwave background observations, we study the co-evolution of DM density perturbation and primordial metric perturbation during DM production. Solving the perturbative Einstein and Boltzmann equations, we unveil an amplified perturbative resonance between the DM density perturbation and the scalar modes of metric perturbation, driven by DM production. Such perturbative resonance does not affect the tensor modes and suppresses the tensor-to-scalar ratio of metric perturbation r. Using a typical model to specify cosmic reheating, we obtain a direct relation between DM particle mass mχ and r, which can constrain mχ in future primordial gravitational wave searches.