Cosmological tests of General Relativity: a principal component analysis

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

18 pages, 24 figures

Scientific paper

10.1103/PhysRevD.85.043508

The next generation of weak lensing surveys will trace the evolution of matter perturbations and gravitational potentials from the matter dominated epoch until today. Along with constraining the dynamics of dark energy, they will probe the relations between matter overdensities, local curvature, and the Newtonian potential. We work with two functions of time and scale to account for any modifications of these relations in the linear regime from those in the LCDM model. We perform a Principal Component Analysis (PCA) to find the eigenmodes and eigenvalues of these functions for surveys like DES and LSST. This paper builds on and significantly extends the PCA analysis of Zhao et al. (2009) in several ways. In particular, we consider the impact of some of the systematic effects expected in weak lensing surveys. We also present the PCA in terms of other choices of the two functions needed to parameterize modified growth on linear scales, and discuss their merits. We analyze the degeneracy between the modified growth functions and other cosmological parameters, paying special attention to the effective equation of state w(z). Finally, we demonstrate the utility of the PCA as an efficient data compression stage which enables one to easily derive constraints on parameters of specific models without recalculating Fisher matrices from scratch.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Cosmological tests of General Relativity: a principal component analysis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cosmological tests of General Relativity: a principal component analysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological tests of General Relativity: a principal component analysis will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-348859

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.