Constraining dark sector perturbations 1: cosmic shear and CMB lensing

Battye, Richard A.; Moss, Adam; Pearson, Jonathan A.

Abstract

We present current and future constraints on equations of state for dark sector perturbations. The equations of state considered are those corresponding to a generalized scalar field model and time-diffeomorphism invariant Script L(g) theories that are equivalent to models of a relativistic elastic medium and also Lorentz violating massive gravity. We develop a theoretical understanding of the observable impact of these models. In order to constrain these models we use CMB temperature data from Planck, BAO measurements, CMB lensing data from Planck and the South Pole Telescope, and weak galaxy lensing data from CFHTLenS. We find non-trivial exclusions on the range of parameters, although the data remains compatible with w=−1. We gauge how future experiments will help to constrain the parameters. This is done via a likelihood analysis for CMB experiments such as CoRE and PRISM, and tomographic galaxy weak lensing surveys, focussing in on the potential discriminatory power of Euclid on mildly non-linear scales.

Citation

Battye, R. A., Moss, A., & Pearson, J. A. (2015). Constraining dark sector perturbations 1: cosmic shear and CMB lensing. Journal of Cosmology and Astroparticle Physics, 2015, Article 048. https://doi.org/10.1088/1475-7516/2015/04/048

• Journal Article Type: Article
• Publication Date: Apr 1, 2015
• Deposit Date: Sep 22, 2014
• Publicly Available Date: Aug 20, 2015
• Journal: Journal of Cosmology and Astroparticle Physics
• Electronic ISSN: 1475-7516
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 2015
• Article Number: 048
• DOI: https://doi.org/10.1088/1475-7516/2015/04/048
• Keywords: Modified gravity, Dark energy experiments, Weak gravitational lensing, Dark energy theory
• Public URL: https://durham-repository.worktribe.com/output/1423363