Work

Determining the equation of state of the expanding Universe: inverse problem in cosmology

Year: 1999

Type: article

Abstract: Even if the luminosity distance as a function of redshift is obtained accurately using, for example, Type Ia supernovae, the equation of state of the Universe cannot be determined uniquely, as it depends on one free parameter Οk0=k/(a02H02), where a0 and H0 are the present scalefactor and the Hubble parameter, respectively. This degeneracy might be resolved if, for example, the time variations of the redshift of quasars are measured as proposed recently by Loeb. Therefore, the equation of state of the Universe (or the metric of the Universe) might be determined in future without any theoretical assumption on the matter content of the Universe.

Source: Monthly Notices of the Royal Astronomical Society

DOI: 10.1046/j.1365-8711.1999.02551.x

Authors: Takashi Nakamura, Takeshi Chiba

Institutions: Kyoto University, Yukawa Institute for Theoretical Physics, The University of Tokyo

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funder: Japan Society for the Promotion of Science

Awards: Gravitational Wave Astronomy using a Sensitive Laser Interferometer, What Consist of Milky Way Halo