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 time-evolving dark energy equation of state in the ΛCDM 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 parameter reaches 4.4%. When Euclid information is included in the analysis, the improvements on the neutrino parameter constraint is 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 FoM 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 specially in more precise future CMB experiments since it provided in our case a 6 times better FoM in respect to the unlensed CMB analysis .

Hubble Parameter Measurement Constraints on the Redshift of the Deceleration–acceleration Transition, Dynamical Dark Energy, and Space Curvature

“…Currently available SN Ia, BAO, growth factor, CMB anisotropy, and other data can tighten the constraints on these parameters, and it will be interesting to study these data sets in conjunction with the H(z) data we have compiled here, but this is beyond the scope of our paper. Near-future data will also result in interesting limits (see, e.g., Podariu et al 2001a;Pavlov et al 2012;Santos et al 2013;Basse et al 2014).…”

Suite of hydrodynamical simulations for the Lyman-αforest with massive neutrinos

“…The most direct way is through the analysis of the CMB radiation, because for the current mass limits their primordial signature does not vanish although neutrinos are still relativistic at the time of recombination (Lesgourgues & Pastor 2006). While the overall sensitivity of massive neutrinos impacts the CMB temperature power spectrum very marginally, there are non-negligible consequences in the polarization maps through the early integrated Sachs Wolfe (ISW) effect (Hinshaw et al 2013), and distinct signatures from the gravitational lensing of the CMB by LSS -both in temperature and polarization (see for instance Santos et al 2013or Battye & Moss 2014. Other methods for quantifying the impact of massive neutrinos involve baryonic tracers of the LSS clustering of matter, and high-redshift surveys.…”

Neutrino masses from CMB B-mode polarization and cosmic growth rate

“…As a result, more "accurate" and "conservative" constraints were obtained than the results in other similar papers. [31][32][33][34][35][36] The "width" of the probability distribution was less than 75 meV after using future observations of the B-mode polarization and cosmic growth rate.…”