Neutrinos in the holographic dark energy model: constraints from latest measurements of expansion history and growth of structure
Abstract
The model of holographic dark energy (HDE) with massive neutrinos and/or dark radiation is investigated in detail. The background and perturbation evolutions in the HDE model are calculated. We employ the PPF approach to overcome the gravity instability difficulty (perturbation divergence of dark energy) led by the equationofstate parameter w evolving across the phantom divide w=1 in the HDE model with c<1. We thus derive the evolutions of density perturbations of various components and metric fluctuations in the HDE model. The impacts of massive neutrino and dark radiation on the CMB anisotropy power spectrum and the matter power spectrum in the HDE scenario are discussed. Furthermore, we constrain the models of HDE with massive neutrinos and/or dark radiation by using the latest measurements of expansion history and growth of structure, including the Planck CMB temperature data, the baryon acoustic oscillation data, the JLA supernova data, the Hubble constant direct measurement, the cosmic shear data of weak lensing, the Planck CMB lensing data, and the redshift space distortions data. We find that ∑ m_{ν}<0.186 eV (95% CL) and N_{eff}=3.75^{+0.28}_{0.32} in the HDE model from the constraints of these data.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 April 2015
 DOI:
 10.1088/14757516/2015/04/038
 arXiv:
 arXiv:1502.04028
 Bibcode:
 2015JCAP...04..038Z
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 18 pages, 5 figures