Revised cosmological parameters after BICEP 2 and BOSS
Abstract
Estimation of parameters of the \lq standard\rq \,model of cosmology have dramatically improved over past few decades due to increasingly exquisite measurements made by Cosmic Microwave Background (CMB) experiments. Recent data from Planck matches well with the minimal CDM model. A likelihood analysis using Planck, WMAP and a selection of high resolution experiments (highL), tensor to scalar ratio is found to be when . Planck also imposes an upper bound on neutrino mass eV using Planck+WMAP+highL+BAO likelihood. However, recently results from BICEP 2 claims the detection of from polarization spectra. Further, results from SDSS-III BOSS large scale galaxy survey constrains the total neutrino mass to eV. It is important to study the consequences of these new measurements on other cosmological parameters. In this paper we assess the revised constraints on cosmological parameters in light of these two measurements that are in some tension with the constraints from Planck. Using the prior on as measured by SDSS-III BOSS and BICEP 2 likelihood, we find that the model with running spectral index () leads to a value of at . But, the model with makes consistent with , at and also shows that is consistent with its theoretical value of at around . Therefore, the analysis in this paper shows that the model with gives consistency with other cosmological parameters ( and ) when the current limits on and are considered. However, on reducing the value of , the model with non-zero gives consistent result of [abridged].
Cite
@article{arxiv.1406.0857,
title = {Revised cosmological parameters after BICEP 2 and BOSS},
author = {Santanu Das and Suvodip Mukherjee and Tarun Souradeep},
journal= {arXiv preprint arXiv:1406.0857},
year = {2015}
}
Comments
14 pages, 10 figures. Matches the published version