Work

The Luminosity Distance, the Equation of State, and the Geometry of the Universe

Year: 1998

Type: article

Abstract: The second derivative of the luminosity distance with respect to the redshift is written in terms of the deceleration parameter q0. We point out that the third derivative contains the information regarding the sound speed of cosmic matter as well as the curvature of the universe. We restrict physically possible parameter ranges of the coefficients. It is found that there is a relation between the coefficients in a flat universe model with matter such that cs0(1+wx0)=0 (cs0 is the total sound speed of the matter component and wx0=px0/ρx0).

Source: Progress of Theoretical Physics

DOI: 10.1143/ptp.100.1077

Authors: T. Chiba, T. Nakamura

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

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Japan Society for the Promotion of Science

Award: What Consist of Milky Way Halo