Constraining dark sector perturbations I: cosmic shear and CMB lensing

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...

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Bibliographic Details
Published in:Journal of Cosmology and Astroparticle Physics
Main Authors: Battye, R A, Moss, A, Pearson, J A
Format: Article in Journal/Newspaper
Language:English
Published: 2015
Subjects:
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
South pole
Online Access:https://research.manchester.ac.uk/en/publications/0d3d2b8d-8824-4944-ba47-bc9aea2d309c
https://doi.org/10.1088/1475-7516/2015/04/048
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Summary: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.

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