2004MNRAS.354..275A

Query : 2004MNRAS.354..275A

2004MNRAS.354..275A - Mon. Not. R. Astron. Soc., 354, 275-291 (2004/October-2)

Is there supernova evidence for dark energy metamorphosis?

ALAM U., SAHNI V., SAINI T.D. and STAROBINSKY A.A.

Abstract (from CDS):

We reconstruct the equation of state w(z) of dark energy (DE) using a recently released data set containing 172 Type Ia supernovae (SNe) without assuming the prior w(z) ≥-1 (in contrast to previous studies). We find that DE evolves rapidly and metamorphoses from dust-like behaviour at high z (w≃ 0 at z∼ 1) to a strongly negative equation of state at present ( w≲-1 at z≃ 0). DE metamorphosis appears to be a robust phenomenon which manifests for a large variety of SNe data samples provided one does not invoke the weak energy prior ρ+p≥ 0. Invoking this prior considerably weakens the rate of growth of w(z). These results demonstrate that DE with an evolving equation of state provides a compelling alternative to a cosmological constant if data are analysed in a prior-free manner and the weak energy condition is not imposed by hand.

Abstract Copyright: 2004 RAS

Journal keyword(s): methods: statistical - cosmological parameters - cosmology: theory

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SN 1999bf SN* 11 49 52.28 -00 41 19.9     20.8     SNIa 4 1

Query : 2004MNRAS.354..275A

Basic data :
SN 1999bf -- SuperNova
Other object types: otypes_help 		SN* (2012A&A,SN)
ICRS coord. (ep=J2000) : 		11 49 52.28 -00 41 19.9 [ ] D 1999IAUC.7134Q...1N
FK4 coord. (ep=B1950 eq=1950) : 		11 47 18.56 -00 24 38.9 [ ]
Gal coord. (ep=J2000) : 		272.41769 +58.48723 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 63512 [~] / z(~) 0.24 [~] / cz 71950 [~]
   D 1999IAUC.7134Q...1N
Spectral type: 		SNIa C 2008yCat....1.2024B
Fluxes (1) :
V 20.8 [~] D 2008yCat.2283....0B
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SN 1999bf

References (4 between 1850 and 2026) (Total 4)
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