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Model independent constraints on mass-varying neutrino scenarios

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Model independent constraints on mass-varying neutrino scenarios

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dc.contributor.author França, Urbano Junior Lopes
dc.contributor.author Lattanzi, Massimiliano
dc.contributor.author Lesgourgues, Julien
dc.contributor.author Pastor Carpi, Sergio
dc.date.accessioned 2014-09-03T09:07:08Z
dc.date.available 2014-09-03T09:07:08Z
dc.date.issued 2009
dc.identifier.citation França, Urbano Junior Lopes Lattanzi, Massimiliano Lesgourgues, Julien Pastor Carpi, Sergio 2009 Model independent constraints on mass-varying neutrino scenarios Physical Review D 80 8 083506-1 083506-13
dc.identifier.uri http://hdl.handle.net/10550/37483
dc.description.abstract Models of dark energy in which neutrinos interact with the scalar field supposed to be responsible for the acceleration of the universe usually imply a variation of the neutrino masses on cosmological time scales. In this work we propose a parameterization for the neutrino mass variation that captures the essentials of those scenarios and allows to constrain them in a model independent way, that is, without resorting to any particular scalar field model. Using WMAP 5yr data combined with the matter power spectrum of SDSS and 2dFGRS, the limit on the present value of the neutrino mass is m0<0.43(0.28) eV at 95% C.L. for the case in which the neutrino mass was lighter (heavier) in the past, a result competitive with the ones imposed for standard (i.e., constant mass) neutrinos. Moreover, for the ratio of the mass variation of the neutrino mass Δmnu over the current mass m0 we found that log[|Δmnu|/m0]<−1.3(−2.7) at 95% C.L. for Δmnu<0(Δmnu>0), totally consistent with no mass variation. These stringent bounds on the mass variation are not related to the neutrino free-streaming history which may affect the matter power spectrum on small scales. On the contrary, they are imposed by the fact that any significant transfer of energy between the neutrino and dark energy components would lead to an instability contradicting CMB and large scale structure data on the largest observable scales.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2009, vol. 80, num. 8, p. 083506-1-083506-13
dc.subject Física
dc.title Model independent constraints on mass-varying neutrino scenarios
dc.type journal article es_ES
dc.date.updated 2014-09-03T09:07:08Z
dc.identifier.doi 10.1103/PhysRevD.80.083506
dc.identifier.idgrec 060091
dc.rights.accessRights open access es_ES

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