Constraining dark sector perturbations I: cosmic shear and CMB lensing

R A Battye, A Moss, J A Pearson

    Research output: Contribution to journalArticlepeer-review

    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 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.
    Original languageEnglish
    JournalJournal of Cosmology and Astroparticle Physics
    Issue number4
    DOIs
    Publication statusPublished - 2015

    Keywords

    • modified gravity
    • dark energy experiments
    • weak gravitational lensing
    • dark energy theory
    • microwave background anisotropies
    • baryon acoustic-oscillations
    • power spectra
    • energy
    • model
    • supernovae
    • cosmology
    • constant
    • cfhtlens

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