TY  - JOUR
AU  - Archidiacono, M.
AU  - Lopez-Honorez, L.
AU  - Mena, O.
PY  - 2014
DA  - 2014//
TI  - Current constraints on early and stressed dark energy models and future 21 cm perspectives
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 123016 - 10pp
VL  - 90
IS  - 12
PB  - Amer Physical Soc
AB  - 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%).
SN  - 1550-7998
UR  - http://arxiv.org/abs/1409.1802
UR  - https://doi.org/10.1103/PhysRevD.90.123016
DO  - 10.1103/PhysRevD.90.123016
LA  - English
N1  - WOS:000347194400007
ID  - Archidiacono_etal2014
ER  -