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Current constraints on early and stressed dark energy models and future 21 cm perspectives

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Current constraints on early and stressed dark energy models and future 21 cm perspectives

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dc.contributor.author Archidiacono, Maria
dc.contributor.author López Honórez, Laura
dc.contributor.author Mena Requejo, Olga
dc.date.accessioned 2015-04-20T10:34:00Z
dc.date.available 2015-04-20T10:34:00Z
dc.date.issued 2014
dc.identifier.citation Archidiacono, Maria López Honórez, Laura Mena Requejo, Olga 2014 Current constraints on early and stressed dark energy models and future 21 cm perspectives Physical Review D 90 12 123016
dc.identifier.uri http://hdl.handle.net/10550/43234
dc.description.abstract Despite the great progress of current cosmological measurements, the nature of the dominant component of the Universe, coined dark energy, is still an open question. Early dark energy is a possible candidate which may also alleviate some fine-tuning issues of the standard paradigm. Using the latest available cosmological data, we find that the 95% C.L. upper bound on the early dark energy density parameter is Tau(eDE) < 0.009. On the other hand, the dark energy component may be a stressed and inhomogeneous fluid. If this is the case, the effective sound speed and the viscosity parameters are unconstrained by current data. Future omniscopelike 21 cm surveys, combined with present cosmic microwave background data, could be able to distinguish between standard quintessence scenarios from other possible models with 2 sigma significance, assuming a non-negligible early dark energy contribution. The precision achieved on the Omega(eDE) parameter from these 21 cm probes could be below O(10%).
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2014, vol. 90, num. 12, p. 123016
dc.subject Física
dc.title Current constraints on early and stressed dark energy models and future 21 cm perspectives
dc.type journal article es_ES
dc.date.updated 2015-04-20T10:34:00Z
dc.identifier.doi 10.1103/PhysRevD.90.123016
dc.identifier.idgrec 102129
dc.rights.accessRights open access es_ES

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