# Constraining dark sector perturbations I: cosmic shear and CMB lensing

## 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.

- Authors:

- Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL (United Kingdom)
- School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD (United Kingdom)
- Centre for Particle Theory, Department of Mathematical Sciences, Durham University, South Road, Durham, DH1 3LE (United Kingdom)

- Publication Date:

- OSTI Identifier:
- 22525866

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; DISTURBANCES; EQUATIONS OF STATE; GALAXIES; GRAVITATION; LIMITING VALUES; NONLINEAR PROBLEMS; OSCILLATIONS; POTENTIALS; RELATIVISTIC RANGE; SCALAR FIELDS; SHEAR; TELESCOPES

### Citation Formats

```
Battye, Richard A., Moss, Adam, and Pearson, Jonathan A., E-mail: richard.battye@manchester.ac.uk, E-mail: adam.moss@nottingham.ac.uk, E-mail: jonathan.pearson@durham.ac.uk.
```*Constraining dark sector perturbations I: cosmic shear and CMB lensing*. United States: N. p., 2015.
Web. doi:10.1088/1475-7516/2015/04/048.

```
Battye, Richard A., Moss, Adam, & Pearson, Jonathan A., E-mail: richard.battye@manchester.ac.uk, E-mail: adam.moss@nottingham.ac.uk, E-mail: jonathan.pearson@durham.ac.uk.
```*Constraining dark sector perturbations I: cosmic shear and CMB lensing*. United States. doi:10.1088/1475-7516/2015/04/048.

```
Battye, Richard A., Moss, Adam, and Pearson, Jonathan A., E-mail: richard.battye@manchester.ac.uk, E-mail: adam.moss@nottingham.ac.uk, E-mail: jonathan.pearson@durham.ac.uk. Wed .
"Constraining dark sector perturbations I: cosmic shear and CMB lensing". United States.
doi:10.1088/1475-7516/2015/04/048.
```

```
@article{osti_22525866,
```

title = {Constraining dark sector perturbations I: cosmic shear and CMB lensing},

author = {Battye, Richard A. and Moss, Adam and Pearson, Jonathan A., E-mail: richard.battye@manchester.ac.uk, E-mail: adam.moss@nottingham.ac.uk, E-mail: jonathan.pearson@durham.ac.uk},

abstractNote = {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.},

doi = {10.1088/1475-7516/2015/04/048},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 04,

volume = 2015,

place = {United States},

year = {Wed Apr 01 00:00:00 EDT 2015},

month = {Wed Apr 01 00:00:00 EDT 2015}

}