Reconstructing the Cosmic Equation of State from Supernova Distances
2000; American Physical Society; Volume: 85; Issue: 6 Linguagem: Inglês
10.1103/physrevlett.85.1162
ISSN1092-0145
AutoresTarun Deep Saini, Somak Raychaudhury, Varun Sahni, Alexei A. Starobinsky,
Tópico(s)Neutrino Physics Research
ResumoObservations of high-redshift supernovae indicate that the universe is accelerating. Here we present a {\em model-independent} method for estimating the form of the potential $V(ϕ)$ of the scalar field driving this acceleration, and the associated equation of state $w_ϕ$. Our method is based on a versatile analytical form for the luminosity distance $D_L$, optimized to fit observed distances to distant supernovae and differentiated to yield $V(ϕ)$ and $w_ϕ$. Our results favor $w_ϕ\simeq -1$ at the present epoch, steadily increasing with redshift. A cosmological constant is consistent with our results.
Referência(s)