Neutrinos and dark energy constraints from future galaxy surveys and CMB lensing information
Abstract
We explore the possibility of obtaining better constraints from future astronomical data by means of the Fisher information matrix formalism. In particular, we consider how cosmic microwave background (CMB) lensing information can improve our parameter error estimation. We consider a massive neutrino scenario and a timeevolving dark energy equation of state in the Λ cold dark matter framework. We use Planck satellite experimental specifications together with the future galaxy survey Euclid in our forecast. We found improvements in almost all studied parameters considering Planck alone when CMB lensing information is used. In this case, the improvement with respect to the constraints found without using CMB lensing is of 93% around the fiducial value for the neutrino parameter. The improvement on one of the dark energy parameters reaches 4.4%. When Euclid information is included in the analysis, the improvements on the neutrino parameter constraint are of approximately 128% around its fiducial value. The addition of Euclid information provides smaller errors on the dark energy parameters as well. For Euclid alone, the figure of merit is a factor of ∼29 higher than that from Planck alone even considering CMB lensing. Finally, the consideration of a nearly perfect CMB experiment showed that CMB lensing cannot be neglected, especially in more precise future CMB experiments, since it provided in our case a sixtimesbetter figure of merit with respect to the unlensed CMB analysis.
 Publication:

Physical Review D
 Pub Date:
 August 2013
 DOI:
 10.1103/PhysRevD.88.043505
 arXiv:
 arXiv:1307.2919
 Bibcode:
 2013PhRvD..88d3505S
 Keywords:

 98.80.k;
 98.70.Vc;
 98.65.Dx;
 Cosmology;
 Background radiations;
 Superclusters;
 largescale structure of the Universe;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 Accepted for publication in PRD