Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approach
Autor(a) principal: | |
---|---|
Data de Publicação: | 2010 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1088/1475-7516/2010/03/011 http://hdl.handle.net/11449/24712 |
Resumo: | We apply the time-renormalization group approach to study the effect of primordial non-Gaussianities in the non-linear evolution of cosmological dark matter density perturbations. This method improves the standard perturbation approach by solving renormalization group-like equations governing the dynamics of gravitational instability. The primordial bispectra constructed from the dark matter density contrast and the velocity fields represent initial conditions for the renormalization group flow. We consider local, equilateral and folded shapes for the initial non-Gaussianity and analyze as well the case in which the non-linear parameter f(NL) parametrizing the strength of the non-Gaussianity depends on the momenta in Fourier space through a power-law relation, the so-called running non-Gaussianity. For the local model of non-Gaussianity we compare our findings for the power-spectrum with those of recent N-body simulations and find that they accurately fit the N-body data up to wave-numbers k similar to 0.25 h/Mpc at z = 0. We also present predictions for the (reduced) matter bispectra for the various shapes of non-Gaussianity. |
id |
UNSP_dfc0be3d9f5348b9f2b0b7d581fd5d3f |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/24712 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approachpower spectrumnon-gaussianitycosmological perturbation theoryWe apply the time-renormalization group approach to study the effect of primordial non-Gaussianities in the non-linear evolution of cosmological dark matter density perturbations. This method improves the standard perturbation approach by solving renormalization group-like equations governing the dynamics of gravitational instability. The primordial bispectra constructed from the dark matter density contrast and the velocity fields represent initial conditions for the renormalization group flow. We consider local, equilateral and folded shapes for the initial non-Gaussianity and analyze as well the case in which the non-linear parameter f(NL) parametrizing the strength of the non-Gaussianity depends on the momenta in Fourier space through a power-law relation, the so-called running non-Gaussianity. For the local model of non-Gaussianity we compare our findings for the power-spectrum with those of recent N-body simulations and find that they accurately fit the N-body data up to wave-numbers k similar to 0.25 h/Mpc at z = 0. We also present predictions for the (reduced) matter bispectra for the various shapes of non-Gaussianity.INFN - Sezione di PadovaFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)ASIEUUniv Padua, Dipartimento Fis G Galilei, I-35131 Padua, ItalyIst Nazl Fis Nucl, Sez Padova, I-35131 Padua, ItalyUniv Estadual Paulista, UNESP, Inst Fis Teor, BR-01156970 São Paulo, BrazilCERN, Div Theory, CH-1211 Geneva 23, SwitzerlandUniv Estadual Paulista, UNESP, Inst Fis Teor, BR-01156970 São Paulo, BrazilFAPESP: 06/00622-8FAPESP: 07/58202-7ASI: 1/016/07/0ASI: 1/072/09/0EU: HPRN-CT-2006-035863Iop Publishing LtdUniv PaduaIst Nazl Fis NuclUniversidade Estadual Paulista (Unesp)CERNBartolo, NicolaBeltran Almeida, Juan P. [UNESP]Matarrese, SabinoPietroni, MassimoRiotto, Antonio2013-09-30T19:03:24Z2014-05-20T14:14:19Z2013-09-30T19:03:24Z2014-05-20T14:14:19Z2010-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article25application/pdfhttp://dx.doi.org/10.1088/1475-7516/2010/03/011Journal of Cosmology and Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 3, p. 25, 2010.1475-7516http://hdl.handle.net/11449/2471210.1088/1475-7516/2010/03/011WOS:000276103000023WOS000276103000023.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Cosmology and Astroparticle Physics5.1261,089info:eu-repo/semantics/openAccess2023-10-24T06:09:29Zoai:repositorio.unesp.br:11449/24712Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-10-24T06:09:29Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approach |
title |
Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approach |
spellingShingle |
Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approach Bartolo, Nicola power spectrum non-gaussianity cosmological perturbation theory |
title_short |
Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approach |
title_full |
Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approach |
title_fullStr |
Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approach |
title_full_unstemmed |
Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approach |
title_sort |
Signatures of primordial non-Gaussianities in the matter power-spectrum and bispectrum: the time-RG approach |
author |
Bartolo, Nicola |
author_facet |
Bartolo, Nicola Beltran Almeida, Juan P. [UNESP] Matarrese, Sabino Pietroni, Massimo Riotto, Antonio |
author_role |
author |
author2 |
Beltran Almeida, Juan P. [UNESP] Matarrese, Sabino Pietroni, Massimo Riotto, Antonio |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Univ Padua Ist Nazl Fis Nucl Universidade Estadual Paulista (Unesp) CERN |
dc.contributor.author.fl_str_mv |
Bartolo, Nicola Beltran Almeida, Juan P. [UNESP] Matarrese, Sabino Pietroni, Massimo Riotto, Antonio |
dc.subject.por.fl_str_mv |
power spectrum non-gaussianity cosmological perturbation theory |
topic |
power spectrum non-gaussianity cosmological perturbation theory |
description |
We apply the time-renormalization group approach to study the effect of primordial non-Gaussianities in the non-linear evolution of cosmological dark matter density perturbations. This method improves the standard perturbation approach by solving renormalization group-like equations governing the dynamics of gravitational instability. The primordial bispectra constructed from the dark matter density contrast and the velocity fields represent initial conditions for the renormalization group flow. We consider local, equilateral and folded shapes for the initial non-Gaussianity and analyze as well the case in which the non-linear parameter f(NL) parametrizing the strength of the non-Gaussianity depends on the momenta in Fourier space through a power-law relation, the so-called running non-Gaussianity. For the local model of non-Gaussianity we compare our findings for the power-spectrum with those of recent N-body simulations and find that they accurately fit the N-body data up to wave-numbers k similar to 0.25 h/Mpc at z = 0. We also present predictions for the (reduced) matter bispectra for the various shapes of non-Gaussianity. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-03-01 2013-09-30T19:03:24Z 2013-09-30T19:03:24Z 2014-05-20T14:14:19Z 2014-05-20T14:14:19Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1088/1475-7516/2010/03/011 Journal of Cosmology and Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 3, p. 25, 2010. 1475-7516 http://hdl.handle.net/11449/24712 10.1088/1475-7516/2010/03/011 WOS:000276103000023 WOS000276103000023.pdf |
url |
http://dx.doi.org/10.1088/1475-7516/2010/03/011 http://hdl.handle.net/11449/24712 |
identifier_str_mv |
Journal of Cosmology and Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 3, p. 25, 2010. 1475-7516 10.1088/1475-7516/2010/03/011 WOS:000276103000023 WOS000276103000023.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Cosmology and Astroparticle Physics 5.126 1,089 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
25 application/pdf |
dc.publisher.none.fl_str_mv |
Iop Publishing Ltd |
publisher.none.fl_str_mv |
Iop Publishing Ltd |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1803046136971264000 |