Constraining decaying dark matter with BOSS data and the effective field theory of large-scale structures
Résumé
We update cosmological constraints on two decaying dark matter models in light of BOSS-DR12 data analyzed under the effective field theory of large-scale structures (EFTofLSS) formalism, together with Planck, Pantheon and other BOSS measurements of the baryonic acoustic oscillation (BAO). In the first model, a fraction of cold dark matter (CDM) decays into dark radiation (DR) with a lifetime . In the second model (recently suggested as a potential resolution to the tension), all the CDM decays with a lifetime into DR and a massive warm dark matter (WDM) particle, with a fraction of the CDM rest mass energy transferred to the DR. Using numerical codes from the recent literature, we perform the first calculation of the mildly nonlinear (matter and galaxy) power spectra with the EFTofLSS for these two models. In the case of DR products, we obtain the constraints (95% C.L.) for lifetimes shorter than the age of the Universe, and in the long-lived regime assuming . We show that Planck data contributes the most to these constraints, with EFTofBOSS providing a marginal improvement over conventional BAO and redshift space distortions () data. In the case of DR and WDM decay products, we find that EFTofBOSS data significantly improves the constraints at 68% C.L. on the CDM lifetime with a prior from KiDS-1000. We show that, in order to fit EFTofBOSS data while lowering to match KiDS-1000, the best-fit model has a longer lifetime , with a larger kick velocity , than that without EFTofBOSS (, ). We anticipate that future surveys will provide exquisite constraints on such models.
Mots clés
baryon: oscillation: acoustic
dark matter: decay
dark matter: lifetime
effective field theory
satellite: Planck
structure
tension
power spectrum: nonlinear
long-lived
redshift
4/3
resolution
velocity
constraint
cosmological model: parameter space
numerical calculations
matter: power spectrum
galaxy: power spectrum
confidence limit