Determining the Cosmic Equation of State from Gravitational Lensing

Details Determining the Cosmic Equation of State from Gravitational Lensing Determining the Cosmic Equation of State from Gravitational Lensing

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999chphl..16..934z&link_type=abstract

Chinese Physics Letters, Volume 16, Issue 12, pp. 934-936 (1999).

Physics

3

Scientific paper

An independent method is proposed to determine the equation of state, omega_x=p_x/rho_x, for dark energy component in the universe. This method is based on gravitational lensing statistics. An analytically simple expression for the optical depth of gravitational lensing in general Friedmann-Robertson-Walker cosmologies with dark energy component is derived. It is shown that for a flat universe the optical depth depends sensitively on the redshift to the source z_s and the equation of state, omega_x, which makes the method proposed here efficient and robust.

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