Work

Reconstructing the Cosmic Equation of State from Supernova Distances

Year: 2000

Type: article

Abstract: Observations of high-redshift supernovae indicate that the Universe is accelerating. Here we present a model-independent method for estimating the form of the potential V(phi) of the scalar field driving this acceleration, and the associated equation of state w(phi). 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(straight phi) and w(straight phi). Our results favor w(phi) approximately -1 at the present epoch, steadily increasing with redshift. A cosmological constant is consistent with our results.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.85.1162

Authors: Tarun Deep Saini, Somak Raychaudhury, Varun Sahni, A. A. Starobinsky

Institutions: Inter-University Centre for Astronomy and Astrophysics, Landau Institute for Theoretical Physics, Max Planck Institute for Astrophysics

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Russian Foundation for Basic Research

OpenAlex ID: W2033876671

FWCI: 19

Cites: 17

Cited by: 401

Related to: 10