Measuring the Universe with galaxy redshift surveys
Abstract
Galaxy redshift surveys are one of the pillars of the current standard cosmological model and remain a key tool in the experimental effort to understand the origin of cosmic acceleration. To this end, the next generation of surveys aim at achieving subpercent precision in the measurement of the equation of state of dark energy $w(z)$ and the growth rate of structure $f(z)$. This however requires comparable control over systematic errors, stressing the need for improved modelling methods. In this contribution we review at the introductory level some highlights of the work done in this direction by the {\it Darklight} project. Supported by an ERC Advanced Grant, {\it Darklight} developed novel techniques for clustering analysis, which were tested through numerical simulations before being finally applied to galaxy data as in particular those of the recently completed VIPERS redshift survey. We focus in particular on: (a) advances on estimating the growth rate of structure from redshiftspace distortions; (b) parameter estimation through global Bayesian reconstruction of the density field from survey data; (c) impact of massive neutrinos on largescale structure measurements. Overall, {\it Darklight} has contributed to paving the way for forthcoming highprecision experiments, such as {\it Euclid}, the next ESA cosmological mission.
 Publication:

arXiv eprints
 Pub Date:
 March 2018
 arXiv:
 arXiv:1803.10814
 Bibcode:
 2018arXiv180310814G
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 16 pages, 10 figures, Review to appear in "Towards a Science Campus in Milan: A snapshot of current research at Physics Department Aldo Pontremoli" (2018, Springer, Berlin, in press)