Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/127543
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Gil Marín, Héctor | - |
dc.contributor.author | Schmidt, Fabian | - |
dc.contributor.author | Hu, Wayne | - |
dc.contributor.author | Jiménez, Raúl (Jiménez Tellado) | - |
dc.contributor.author | Verde, Licia | - |
dc.date.accessioned | 2019-01-23T10:42:24Z | - |
dc.date.available | 2019-01-23T10:42:24Z | - |
dc.date.issued | 2011 | - |
dc.identifier.issn | 1475-7516 | - |
dc.identifier.uri | http://hdl.handle.net/2445/127543 | - |
dc.description.abstract | In this paper we analyze a suite of cosmological simulations of modified gravitational action f(R) models, where cosmic acceleration is induced by a scalar field that acts as a fifth force on all forms of matter. In particular, we focus on the bispectrum of the dark matter density field on mildly non-linear scales. For models with the same initial power spectrum, the dark matter bispectrum shows significant differences for cases where the final dark matter power spectrum also differs. Given the different dependence on bias of the galaxy power spectrum and bispectrum, bispectrum measurements can close the loophole of galaxy bias hiding differences in the power spectrum. Alternatively, changes in the initial power spectrum can also hide differences. By constructing ΛCDM models with very similar final non-linear power spectra, we show that the differences in the bispectrum are reduced (lesssim4%) and are comparable with differences in the imperfectly matched power spectra. These results indicate that the bispectrum depends mainly on the power spectrum and less sensitively on the gravitational signatures of the f(R) model. This weak dependence of the matter bispectrum on gravity makes it useful for breaking degeneracies associated with galaxy bias, even for models beyond general relativity. | - |
dc.format.extent | 14 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Institute of Physics (IOP) | - |
dc.relation.isformatof | Versió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2011/11/019 | - |
dc.relation.ispartof | Journal of Cosmology and Astroparticle Physics, 2011, vol. 2011, num. 019 | - |
dc.relation.uri | https://doi.org/10.1088/1475-7516/2011/11/019 | - |
dc.rights | (c) IOP Publishing and Sissa Medialab, 2011 | - |
dc.source | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) | - |
dc.subject.classification | Cosmologia | - |
dc.subject.classification | Mètodes de simulació | - |
dc.subject.other | Cosmology | - |
dc.subject.other | Simulation methods | - |
dc.title | The bispectrum of f(R) cosmologies | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 606094 | - |
dc.date.updated | 2019-01-23T10:42:24Z | - |
dc.relation.projectID | info:eu-repo/grantAgreement/EC/FP7/240117/EU//PHYS.LSS | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Publicacions de projectes de recerca finançats per la UE |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
606094.pdf | 849.28 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.