TY  - JOUR
AU  - Stadler, J.
AU  - Boehm, C.
AU  - Mena, O.
PY  - 2020
DA  - 2020//
TI  - Is it mixed dark matter or neutrino masses?
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 039
EP  - 18pp
VL  - 01
IS  - 1
PB  - Iop Publishing Ltd
KW  - cluster counts
KW  - cosmological parameters from CMBR
KW  - cosmological parameters from LSS
KW  - neutrino masses from cosmology
AB  - In this paper, we explore a scenario where the dark matter is a mixture of interacting and non interacting species. Assuming dark matter-photon interactions for the interacting species, we find that the suppression of the matter power spectrum in this scenario can mimic that expected in the case of massive neutrinos. Our numerical studies include present limits from Planck Cosmic Microwave Background data, which render the strength of the dark matter photon interaction unconstrained when the fraction of interacting dark matter is small. Despite the large entangling between mixed dark matter and neutrino masses, we show that future measurements from the Dark Energy Instrument (DESI) could help in establishing the dark matter and the neutrino properties simultaneously, provided that the interaction rate is very close to its current limits and the fraction of interacting dark matter is at least of O (10%). However, for that region of parameter space where a small fraction of interacting DM coincides with a comparatively large interaction rate, our analysis highlights a considerable degeneracy between the mixed dark matter parameters and the neutrino mass scale.
SN  - 1475-7516
UR  - https://arxiv.org/abs/1807.10034
UR  - https://doi.org/10.1088/1475-7516/2020/01/039
DO  - 10.1088/1475-7516/2020/01/039
LA  - English
N1  - WOS:000528025800040
ID  - Stadler_etal2020
ER  -