Constraining dark sector perturbations II: ISW and CMB lensing tomography
Any Dark Energy (DE) or Modified Gravity (MG) model that deviates from a cosmological constant requires a consistent treatment of its perturbations, which can be described in terms of an effective entropy perturbation and an anisotropic stress. We have considered a recently proposed generic paramete...
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ftumanchesterpub:oai:pure.atira.dk:publications/f38f94da-d9e0-4734-864b-b92817af11d0 2023-11-12T04:26:23+01:00 Constraining dark sector perturbations II: ISW and CMB lensing tomography Soergel, B Giannantonio, T Weller, J Battye, R A 2015 https://research.manchester.ac.uk/en/publications/f38f94da-d9e0-4734-864b-b92817af11d0 https://doi.org/10.1088/1475-7516/2015/02/037 eng eng info:eu-repo/semantics/closedAccess Soergel , B , Giannantonio , T , Weller , J & Battye , R A 2015 , ' Constraining dark sector perturbations II: ISW and CMB lensing tomography ' , Journal of Cosmology and Astroparticle Physics , no. 2 . https://doi.org/10.1088/1475-7516/2015/02/037 modified gravity galaxy clustering integrated sachs-wolfe effect dark energy theory microwave background anisotropies baryon acoustic-oscillations south-pole telescope digital sky survey cosmological constant systematic uncertainties field-equations power spectra high-redshift article 2015 ftumanchesterpub https://doi.org/10.1088/1475-7516/2015/02/037 2023-10-30T09:12:54Z Any Dark Energy (DE) or Modified Gravity (MG) model that deviates from a cosmological constant requires a consistent treatment of its perturbations, which can be described in terms of an effective entropy perturbation and an anisotropic stress. We have considered a recently proposed generic parameterisation of DE/MG perturbations and compared it to data from the Planck satellite and six galaxy catalogues, including temperature-galaxy (Tg), CMB lensing-galaxy (phi g) and galaxy-galaxy (gg) correlations. Combining these observables of structure formation with tests of the background expansion allows us to investigate the properties of DE/MG both at the background and the perturbative level. Our constraints on DE/MG are mostly in agreement with the cosmological constant paradigm, while we also find that the constraint on the equation of state w (assumed to be constant) depends on the model assumed for the perturbation evolution. We obtain w = -0.92(-0.16)(+0.20) (95% CL; CMB+gg+Tg) in the entropy perturbation scenario; in the anisotropic stress case the result is w = -0.86(-0.16)(+0.17). Including the lensing correlations shifts the results towards higher values of w. If we include a prior on the expansion history from recent Baryon Acoustic Oscillations (BAO) measurements, we find that the constraints tighten closely around w = -1, making it impossible to measure any DE/MG perturbation evolution parameters. If, however, upcoming observations from surveys like DES, Euclid or LSST show indications for a deviation from a cosmological constant, our formalism will be a useful tool towards model selection in the dark sector. Article in Journal/Newspaper South pole The University of Manchester: Research Explorer South Pole Journal of Cosmology and Astroparticle Physics 2015 02 037 037 |
institution |
Open Polar |
collection |
The University of Manchester: Research Explorer |
op_collection_id |
ftumanchesterpub |
language |
English |
topic |
modified gravity galaxy clustering integrated sachs-wolfe effect dark energy theory microwave background anisotropies baryon acoustic-oscillations south-pole telescope digital sky survey cosmological constant systematic uncertainties field-equations power spectra high-redshift |
spellingShingle |
modified gravity galaxy clustering integrated sachs-wolfe effect dark energy theory microwave background anisotropies baryon acoustic-oscillations south-pole telescope digital sky survey cosmological constant systematic uncertainties field-equations power spectra high-redshift Soergel, B Giannantonio, T Weller, J Battye, R A Constraining dark sector perturbations II: ISW and CMB lensing tomography |
topic_facet |
modified gravity galaxy clustering integrated sachs-wolfe effect dark energy theory microwave background anisotropies baryon acoustic-oscillations south-pole telescope digital sky survey cosmological constant systematic uncertainties field-equations power spectra high-redshift |
description |
Any Dark Energy (DE) or Modified Gravity (MG) model that deviates from a cosmological constant requires a consistent treatment of its perturbations, which can be described in terms of an effective entropy perturbation and an anisotropic stress. We have considered a recently proposed generic parameterisation of DE/MG perturbations and compared it to data from the Planck satellite and six galaxy catalogues, including temperature-galaxy (Tg), CMB lensing-galaxy (phi g) and galaxy-galaxy (gg) correlations. Combining these observables of structure formation with tests of the background expansion allows us to investigate the properties of DE/MG both at the background and the perturbative level. Our constraints on DE/MG are mostly in agreement with the cosmological constant paradigm, while we also find that the constraint on the equation of state w (assumed to be constant) depends on the model assumed for the perturbation evolution. We obtain w = -0.92(-0.16)(+0.20) (95% CL; CMB+gg+Tg) in the entropy perturbation scenario; in the anisotropic stress case the result is w = -0.86(-0.16)(+0.17). Including the lensing correlations shifts the results towards higher values of w. If we include a prior on the expansion history from recent Baryon Acoustic Oscillations (BAO) measurements, we find that the constraints tighten closely around w = -1, making it impossible to measure any DE/MG perturbation evolution parameters. If, however, upcoming observations from surveys like DES, Euclid or LSST show indications for a deviation from a cosmological constant, our formalism will be a useful tool towards model selection in the dark sector. |
format |
Article in Journal/Newspaper |
author |
Soergel, B Giannantonio, T Weller, J Battye, R A |
author_facet |
Soergel, B Giannantonio, T Weller, J Battye, R A |
author_sort |
Soergel, B |
title |
Constraining dark sector perturbations II: ISW and CMB lensing tomography |
title_short |
Constraining dark sector perturbations II: ISW and CMB lensing tomography |
title_full |
Constraining dark sector perturbations II: ISW and CMB lensing tomography |
title_fullStr |
Constraining dark sector perturbations II: ISW and CMB lensing tomography |
title_full_unstemmed |
Constraining dark sector perturbations II: ISW and CMB lensing tomography |
title_sort |
constraining dark sector perturbations ii: isw and cmb lensing tomography |
publishDate |
2015 |
url |
https://research.manchester.ac.uk/en/publications/f38f94da-d9e0-4734-864b-b92817af11d0 https://doi.org/10.1088/1475-7516/2015/02/037 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
Soergel , B , Giannantonio , T , Weller , J & Battye , R A 2015 , ' Constraining dark sector perturbations II: ISW and CMB lensing tomography ' , Journal of Cosmology and Astroparticle Physics , no. 2 . https://doi.org/10.1088/1475-7516/2015/02/037 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1088/1475-7516/2015/02/037 |
container_title |
Journal of Cosmology and Astroparticle Physics |
container_volume |
2015 |
container_issue |
02 |
container_start_page |
037 |
op_container_end_page |
037 |
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1782340386199437312 |