Observational Signature of Extended Gravity Theories

Details Observational Signature of Extended Gravity Theories Observational Signature of Extended Gravity Theories

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007idm..conf..647p&link_type=abstract

THE IDENTIFICATION OF DARK MATTER. Proceedings of the Sixth International Workshop. Held 11-16 September 2006 in Rhodes, Greece.

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The observed current accelerating expansion of the universe can be attributed to either the existence of a negative pressure energy component (dark energy) in the universe or to modifications of general relativity. The discovery of observational signatures that may distinguish between the two classes of theories is a major challenge for modern cosmology. Here I briefly discuss one such potential signature: The change of sign of the expression (d(H2(z)))/(dz) - 3Ω 0mH20(1+z)2 (where H(z is the Hubble parameter at redshift z) which is equivalent to an equation of state parameter w(z) crossing the w = - 1 line. I also review the current information provided by observational probes with respect to the above cosmological test.

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