Evolution of perturbations and cosmological constraints in decaying dark matter models with arbitrary decay mass products

Abstract

Decaying dark matter (DDM) is a candidate which can solve the discrepancies between predictions of the concordance $\Lambda$CDM model and observations at small scales such as the number counts of companion galaxies of the Milky Way and the density profile at the center of galaxies. Previous studies are limited to the cases where the decay particles are massless and/or have almost degenerate masses with that of mother particles. Here we expand the DDM models so that one can consider the DDM with arbitrary lifetime and the decay products with arbitrary masses. We calculate the time evolutions of perturbed phase-space distribution functions of decay products for the first time and study effects of DDM on the temperature anisotropy in the cosmic microwave background and the matter power spectrum at present. From a recent observational estimate of ${\sigma }_8$, we derive constraints on the lifetime of DDM and the mass ratio between the decay products and DDM. We also discuss implications of the DDM model for the discrepancy in the measurements of ${\sigma }_8$ recently claimed by the Planck satellite collaboration.

30 pages, 12 figures, published on JCAP

References in corpus (4)

• Dark-Matter Decays and Self-Gravitating Halos
• A Model For Late Dark Matter Decay
• Hunting long-lived gluinos at the Pierre Auger Observatory
• Constraining Decaying Dark Matter

Cited by in corpus (26)

• ETHOS - An Effective Theory of Structure Formation: From dark particle physics to the matter distribution of the Universe
• A fresh look at linear cosmological constraints on a decaying dark matter component
• Strongest model-independent bound on the lifetime of Dark Matter
• Reconciling Planck results with low redshift astronomical measurements
• Decaying dark matter and the tension in ${\sigma }_8$
• Dark matter component decaying after recombination: lensing constraints with Planck data
• Cosmological Limits on the Neutrino Mass and Lifetime
• Linear cosmological constraints on 2-body decaying dark matter scenarios and the $S_8$ tension
• Updated constraints on decaying cold dark matter
• Self-interacting dark matter from late decays and the $H_0$ tension
• Constraints on dark matter to dark radiation conversion in the late universe with DES-Y1 and external data
• Do you smell something decaying? Updated linear constraints on decaying dark matter scenarios
• Fractional Dark Matter decay: cosmological imprints and observational constraints
• Cosmological Structure Formation in Decaying Dark Matter Models
• Constraints on decaying dark matter from weak lensing and cluster counts
• Effects of primordial black holes quantum gravity decay on galaxy clustering
• Can decaying dark matter scenarios alleviate both $H_0$ and ${\sigma }_8$ tensions?
• Sub-GeV Dark Matter Shining at Future MeV Gamma-Ray Telescopes
• Decaying axinolike dark matter: Discriminative solution to small-scale issues
• Leptoquarks and Real Singlets: A Richer Scalar Sector Behind the Origin of Dark Matter
• Euclid preparation. Sensitivity to non-standard particle dark matter model
• The FLAMINGO project: cosmology with the redshift dependence of weak gravitational lensing peaks
• Stochastic dark matter: Covariant Brownian motion from Planckian discreteness
• Rapid and accurate numerical evolution of linear cosmological perturbations with non-cold relics
• Probing Non-Minimal Dark Sectors via the 21 cm Line at Cosmic Dawn
• Constraining decaying dark matter with BOSS data and the effective field theory of large-scale structures