An improved fitting formula for the dark matter bispectrum

In this paper we present an improved fitting formula for the dark matter bispectrum motivated by the previous phenomenological approach of ref. [1]. We use a set of LCDM simulations to calibrate the fitting parameters in the k-range of 0.03 h/Mpc ≤ k ≤ 0.4 h/Mpc and in the redshift range of 0 ≤ z ≤...

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Detalhes bibliográficos
Autores: Gil Marín, Héctor, Wagner, Christian, Fragkoudi, Frantzeska, Jiménez, Raúl (Jiménez Tellado), Verde, Licia
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2012
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/127562
Acesso em linha:https://hdl.handle.net/2445/127562
Access Level:acceso abierto
Palavra-chave:Cosmologia
Matèria fosca (Astronomia)
Galàxies
Cosmology
Dark matter (Astronomy)
Galaxies
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spelling An improved fitting formula for the dark matter bispectrumGil Marín, HéctorWagner, ChristianFragkoudi, FrantzeskaJiménez, Raúl (Jiménez Tellado)Verde, LiciaCosmologiaMatèria fosca (Astronomia)GalàxiesCosmologyDark matter (Astronomy)GalaxiesIn this paper we present an improved fitting formula for the dark matter bispectrum motivated by the previous phenomenological approach of ref. [1]. We use a set of LCDM simulations to calibrate the fitting parameters in the k-range of 0.03 h/Mpc ≤ k ≤ 0.4 h/Mpc and in the redshift range of 0 ≤ z ≤ 1.5. This new proposed fit describes well the BAO-features although it was not designed to. The deviation between the simulations output and our analytic prediction is typically less than 5% and in the worst case is never above 10%. We envision that this new analytic fitting formula will be very useful in providing reliable predictions for the non-linear dark matter bispectrum for LCDM models.Institute of Physics (IOP)2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/127562Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2012/02/047Journal of Cosmology and Astroparticle Physics, 2012, vol. 02, num. 047https://doi.org/10.1088/1475-7516/2012/02/047info:eu-repo/grantAgreement/EC/FP7/226354info:eu-repo/grantAgreement/EC/FP7/240117(c) IOP Publishing and Sissa Medialab, 2012info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1275622026-05-27T06:46:51Z
dc.title.none.fl_str_mv An improved fitting formula for the dark matter bispectrum
title An improved fitting formula for the dark matter bispectrum
spellingShingle An improved fitting formula for the dark matter bispectrum
Gil Marín, Héctor
Cosmologia
Matèria fosca (Astronomia)
Galàxies
Cosmology
Dark matter (Astronomy)
Galaxies
title_short An improved fitting formula for the dark matter bispectrum
title_full An improved fitting formula for the dark matter bispectrum
title_fullStr An improved fitting formula for the dark matter bispectrum
title_full_unstemmed An improved fitting formula for the dark matter bispectrum
title_sort An improved fitting formula for the dark matter bispectrum
dc.creator.none.fl_str_mv Gil Marín, Héctor
Wagner, Christian
Fragkoudi, Frantzeska
Jiménez, Raúl (Jiménez Tellado)
Verde, Licia
author Gil Marín, Héctor
author_facet Gil Marín, Héctor
Wagner, Christian
Fragkoudi, Frantzeska
Jiménez, Raúl (Jiménez Tellado)
Verde, Licia
author_role author
author2 Wagner, Christian
Fragkoudi, Frantzeska
Jiménez, Raúl (Jiménez Tellado)
Verde, Licia
author2_role author
author
author
author
dc.subject.none.fl_str_mv Cosmologia
Matèria fosca (Astronomia)
Galàxies
Cosmology
Dark matter (Astronomy)
Galaxies
topic Cosmologia
Matèria fosca (Astronomia)
Galàxies
Cosmology
Dark matter (Astronomy)
Galaxies
description In this paper we present an improved fitting formula for the dark matter bispectrum motivated by the previous phenomenological approach of ref. [1]. We use a set of LCDM simulations to calibrate the fitting parameters in the k-range of 0.03 h/Mpc ≤ k ≤ 0.4 h/Mpc and in the redshift range of 0 ≤ z ≤ 1.5. This new proposed fit describes well the BAO-features although it was not designed to. The deviation between the simulations output and our analytic prediction is typically less than 5% and in the worst case is never above 10%. We envision that this new analytic fitting formula will be very useful in providing reliable predictions for the non-linear dark matter bispectrum for LCDM models.
publishDate 2012
dc.date.none.fl_str_mv 2012
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/2445/127562
url https://hdl.handle.net/2445/127562
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2012/02/047
Journal of Cosmology and Astroparticle Physics, 2012, vol. 02, num. 047
https://doi.org/10.1088/1475-7516/2012/02/047
info:eu-repo/grantAgreement/EC/FP7/226354
info:eu-repo/grantAgreement/EC/FP7/240117
dc.rights.none.fl_str_mv (c) IOP Publishing and Sissa Medialab, 2012
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) IOP Publishing and Sissa Medialab, 2012
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 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:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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