Modified gravity or imperfect dark matter: a model-independent discrimination

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dc.contributor.authorAparicio Resco, Miguel
dc.contributor.authorLópez Maroto, Antonio
dc.date.accessioned2023-06-17T09:02:12Z
dc.date.available2023-06-17T09:02:12Z
dc.date.issued2021-02
dc.description© 2021 IOP Publishing Ltd We thank Jose Beltran Jimenez for their interesting comments and discussions about the manuscript. We would also like to thank the anonymous referee for useful comments and suggestions. M.A.R acknowledges support from UCM predoctoral grant. This work has been supported by the Spanish MINECO grants FIS2016-78859-P(AEI/FEDER, UE) and Red Consolider MultiDark FPA2017-90566-REDC.
dc.description.abstractWe analyze how to parametrize general modifications of the dark matter perturbations equations in a model-independent way. We prove that a general model with an imperfect and non-conserved dark matter fluid with bulk and shear viscosities and heat flux in a modified gravity scenario can be described with five general functions of time and scale. We focus on the sub-Hubble regime within the quasi-static approximation and calculate the observable power spectra of the galaxy distribution, galaxy velocities and weak lensing and find that these observables are only sensitive to three combinations of the initial five functions. Deviations of these three observable functions with respect to ACDM give us different characteristic signals which allow us to determine in which cases it is possible to discriminate a modification of gravity from an imperfect or non-conserved dark matter. Finally, we perform a Fisher forecast analysis for these three parameters and show an example for a particular model with shear viscosity.
dc.description.departmentDepto. de Física Teórica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)/FEDER
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)/ Red Consolider MultiDark
dc.description.sponsorshipUCM predoctoral grant
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/64863
dc.identifier.doi10.1088/1475-7516/2021/02/020
dc.identifier.issn1475-7516
dc.identifier.officialurlhttp://dx.doi.org/10.1088/1475-7516/2021/02/020
dc.identifier.relatedurlhttps://iopscience.iop.org/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/7996
dc.issue.number2
dc.journal.titleJournal of cosmology and astroparticle physics.
dc.language.isoeng
dc.publisherIOP Publishing Ltd
dc.relation.projectIDFIS2016-78859-P
dc.relation.projectIDFPA2017-90566-REDC
dc.rights.accessRightsopen access
dc.subject.cdu53
dc.subject.keywordCosmological constant
dc.subject.keywordGalaxies
dc.subject.keywordUniverse
dc.subject.ucmFísica (Física)
dc.subject.unesco22 Física
dc.titleModified gravity or imperfect dark matter: a model-independent discrimination
dc.typejournal article
dspace.entity.typePublication
relation.isAuthorOfPublication3710a5f4-4b96-4111-ac3e-0ac02844deaf
relation.isAuthorOfPublicatione14691a1-d3b0-47b7-96d5-24d645534471
relation.isAuthorOfPublication.latestForDiscovery3710a5f4-4b96-4111-ac3e-0ac02844deaf
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