Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space

We investigate the accuracy of Eulerian perturbation theory for describing the matter and galaxy power spectra in real and redshift space in light of future observational probes for precision cosmology. Comparing the analytical results with a large suite of N-body simulations (160 independent boxes...

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Detalles Bibliográficos
Autores: Gil Marín, Héctor, Wagner, Christian, Verde, Licia, Porciani, Cristiano, Jiménez, Raúl (Jiménez Tellado)
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2012
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/126624
Acceso en línea:https://hdl.handle.net/2445/126624
Access Level:acceso abierto
Palabra clave:Cosmologia
Matèria interstel·lar
Cosmology
Interstellar matter
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spelling Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift spaceGil Marín, HéctorWagner, ChristianVerde, LiciaPorciani, CristianoJiménez, Raúl (Jiménez Tellado)CosmologiaMatèria interstel·larCosmologyInterstellar matterWe investigate the accuracy of Eulerian perturbation theory for describing the matter and galaxy power spectra in real and redshift space in light of future observational probes for precision cosmology. Comparing the analytical results with a large suite of N-body simulations (160 independent boxes of 13.8 (Gpc/h)3 volume each, which are publicly available), we find that re-summing terms in the standard perturbative approach predicts the real-space matter power spectrum with an accuracy of lesssim2% for k ≤ 0.20 h/Mpc at redshifts zlesssim1.5. This is obtained following the widespread technique of writing the resummed propagator in terms of 1-loop contributions. We show that the accuracy of this scheme increases by considering higher-order terms in the resummed propagator. By combining resummed perturbation theories with several models for the mappings from real to redshift space discussed in the literature, the multipoles of the dark-matter power spectrum can be described with sub-percent deviations from N-body results for k ≤ 0.15 h/Mpc at zlesssim1. As a consequence, the logarithmic growth rate, f, can be recovered with sub-percent accuracy on these scales. Extending the models to massive dark-matter haloes in redshift space, our results describe the monopole term from N-body data within 2% accuracy for scales k ≤ 0.15 h/Mpc at zlesssim0.5; here f can be recovered within < 5% when the halo bias is known. We conclude that these techniques are suitable to extract cosmological information from future galaxy surveys.Institute of Physics (IOP)2018201820122018info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion34 p.application/pdfhttps://hdl.handle.net/2445/126624Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1088/1475-7516/2012/11/029Journal of Cosmology and Astroparticle Physics, 2012, vol. 2012, num. 029https://doi.org/10.1088/1475-7516/2012/11/029info:eu-repo/grantAgreement/EC/FP7/240117cc by (c) Gil Marín, Héctor et al., 2012http://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1266242026-05-29T05:05:01Z
dc.title.none.fl_str_mv Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
title Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
spellingShingle Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
Gil Marín, Héctor
Cosmologia
Matèria interstel·lar
Cosmology
Interstellar matter
title_short Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
title_full Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
title_fullStr Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
title_full_unstemmed Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
title_sort Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
dc.creator.none.fl_str_mv Gil Marín, Héctor
Wagner, Christian
Verde, Licia
Porciani, Cristiano
Jiménez, Raúl (Jiménez Tellado)
author Gil Marín, Héctor
author_facet Gil Marín, Héctor
Wagner, Christian
Verde, Licia
Porciani, Cristiano
Jiménez, Raúl (Jiménez Tellado)
author_role author
author2 Wagner, Christian
Verde, Licia
Porciani, Cristiano
Jiménez, Raúl (Jiménez Tellado)
author2_role author
author
author
author
dc.subject.none.fl_str_mv Cosmologia
Matèria interstel·lar
Cosmology
Interstellar matter
topic Cosmologia
Matèria interstel·lar
Cosmology
Interstellar matter
description We investigate the accuracy of Eulerian perturbation theory for describing the matter and galaxy power spectra in real and redshift space in light of future observational probes for precision cosmology. Comparing the analytical results with a large suite of N-body simulations (160 independent boxes of 13.8 (Gpc/h)3 volume each, which are publicly available), we find that re-summing terms in the standard perturbative approach predicts the real-space matter power spectrum with an accuracy of lesssim2% for k ≤ 0.20 h/Mpc at redshifts zlesssim1.5. This is obtained following the widespread technique of writing the resummed propagator in terms of 1-loop contributions. We show that the accuracy of this scheme increases by considering higher-order terms in the resummed propagator. By combining resummed perturbation theories with several models for the mappings from real to redshift space discussed in the literature, the multipoles of the dark-matter power spectrum can be described with sub-percent deviations from N-body results for k ≤ 0.15 h/Mpc at zlesssim1. As a consequence, the logarithmic growth rate, f, can be recovered with sub-percent accuracy on these scales. Extending the models to massive dark-matter haloes in redshift space, our results describe the monopole term from N-body data within 2% accuracy for scales k ≤ 0.15 h/Mpc at zlesssim0.5; here f can be recovered within < 5% when the halo bias is known. We conclude that these techniques are suitable to extract cosmological information from future galaxy surveys.
publishDate 2012
dc.date.none.fl_str_mv 2012
2018
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/126624
url https://hdl.handle.net/2445/126624
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1088/1475-7516/2012/11/029
Journal of Cosmology and Astroparticle Physics, 2012, vol. 2012, num. 029
https://doi.org/10.1088/1475-7516/2012/11/029
info:eu-repo/grantAgreement/EC/FP7/240117
dc.rights.none.fl_str_mv cc by (c) Gil Marín, Héctor et al., 2012
http://creativecommons.org/licenses/by/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc by (c) Gil Marín, Héctor et al., 2012
http://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 34 p.
application/pdf
dc.publisher.none.fl_str_mv Institute of Physics (IOP)
publisher.none.fl_str_mv Institute of Physics (IOP)
dc.source.none.fl_str_mv Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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