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dc.contributor.authorDiaz Rivero, Ana
dc.contributor.authorMiranda, V.
dc.contributor.authorDvorkin, Cora
dc.date.accessioned2019-09-26T22:25:31Z
dc.date.available2019-09-26T22:25:31Z
dc.date.issued2019-09-04
dc.identifier.citationRivero, A. D., Miranda, V., & Dvorkin, C. (2019). Observable predictions for massive-neutrino cosmologies with model-independent dark energy. Physical Review D. 100. 10.1103/PhysRevD.100.063504.en_US
dc.identifier.issn2470-0010
dc.identifier.doi10.1103/physrevd.100.063504
dc.identifier.urihttp://hdl.handle.net/10150/634614
dc.description.abstractWe investigate the bounds on the sum of neutrino masses in a cosmic-acceleration scenario where the equation of state w(z) of dark energy (DE) is constructed in a model-independent way, using a basis of principal components (PCs) that are allowed to cross the phantom barrier w(z)=−1. We find that the additional freedom provided to w(z) means the DE can undo changes in the background expansion induced by massive neutrinos at low redshifts. This has two significant consequences: (1) it leads to a substantial increase in the upper bound for the sum of the neutrino masses (Mν<0.33–0.55 eV at the 95% C.L. depending on the data sets and number of PCs included) compared to studies that choose a specific parametrization for w(z); and (2) it causes ∼1σ deviations from ΛCDM in the luminosity distance and the Hubble expansion rate at higher redshifts (z≳2), where the contribution of DE is subdominant and there is little constraining data. The second point consequently means that there are also observable deviations in the shear power spectrum and in the matter power spectrum at low redshift, since the clustering of matter throughout cosmic time depends on the expansion rate. This provides a compelling case to pursue high-z BAO and SN measurements as a way of disentangling the effects of neutrinos and dark energy. Finally, we find that the additional freedom given to the dark energy component has the effect of lowering S8 with respect to ΛCDM.en_US
dc.description.sponsorshipNSF [AST-1813694]; Department of Energy (DOE) [DE-SC0019018]; Dean's Competitive Fund for Promising Scholarship at Harvard University; NASA [ROSES ATP 16-ATP16-0084, ADAP 16-ADAP16-0116]; University of Arizona; University of Chicago; Harvard University Research Computing Centersen_US
dc.language.isoenen_US
dc.publisherAMER PHYSICAL SOCen_US
dc.rightsCopyright © 2019 American Physical Society.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleObservable predictions for massive-neutrino cosmologies with model-independent dark energyen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Steward Observ, Dept Astronen_US
dc.identifier.journalPHYSICAL REVIEW Den_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume100
dc.source.issue6
refterms.dateFOA2019-09-26T22:25:31Z


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