Determining the Cosmic Equation of State from Gravitational Lensing

Chin. Phys. Lett.

1999, Vol. 16

Issue (12): 934-937 DOI:

Original Articles

Determining the Cosmic Equation of State from Gravitational Lensing

ZHU Zong-hong;CAO Li

Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012

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ZHU Zong-hong, CAO Li 1999 Chin. Phys. Lett. 16 934-937

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Abstract An independent method is proposed to determine the equation of state, ω_x ≡ p_x/ρ_x, for the 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 ω_x which makes the method proposed here efficient and robust.

Keywords: 98.80.Hw 98.62.Sb 98.80.Es

Published: 01 December 1999

PACS:	98.80.Hw
	98.62.Sb	(Gravitational lenses and luminous arcs)
	98.80.Es	(Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc))

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y1999/V16/I12/0934

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