Work

Echo of interactions in the dark sector

Year: 2017

Type: article

Abstract: We investigate the observational constraints on an interacting vacuum energy scenario with two different neutrino schemes (with and without a sterile neutrino) using the most recent data from cosmic microwave background (CMB) temperature and polarization anisotropy, baryon acoustic oscillations (BAO), type Ia supernovae from JLA sample and structure growth inferred from cluster counts. We find that inclusion of the galaxy clusters data with the minimal data combination $\mathrm{CMB}+\mathrm{BAO}+\mathrm{JLA}$ suggests an interaction in the dark sector, implying the decay of dark matter particles into dark energy, since the constraints obtained by including the galaxy clusters data yield a non-null and negative coupling parameter between the dark components at 99% confidence level. We deduce that the current tensions on the parameters ${H}_{0}$ and ${\ensuremath{\sigma}}_{8}$ can be alleviated within the framework of the interacting as well as noninteracting vacuum energy models with sterile neutrinos.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.96.103511

Authors: Suresh Kumar, Rafael C. Nunes

Institutions: Birla Institute of Technology and Science, Pilani, Universidade Federal de Juiz de Fora

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Department of Science and Technology, Ministry of Science and Technology, India, Science and Engineering Research Board

Award: G1899255544