Physics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jphcs.189a2031p&link_type=abstract
Journal of Physics: Conference Series, Volume 189, Issue 1, pp. 012031 (2009).
Physics
Scientific paper
Recent high quality cosmological observations have confirmed and mapped in detail the accelerating expansion of the universe. These observations involve geometrical methods (use of standard candles and standard rulers) and dynamical methods (measured growth rate of cosmological perturbations). The Cosmological Constant (effective equation of state parameter of w = -1) remains consistent with all current data as a driving force of the acceleration and can be generated by quantum fluctuations of the vacuum with a proper cutoff. A signature in the Casimir effect would be expected in that case. An Evolving Dark Energy Density (w = w(t)) is also allowed by the data and a subset of the allowed evolving forms, which corresponds to crossing of the line w = -1, is inconsistent with most models based on General Relativity. On the other hand, scalar tensor extensions of General Relativity are consistent with the full range of allowed expansion histories. Demanding consistency of Scalar-Tensor theories with solar system tests and full range of allowed expansion histories implies constraints on Newtons constant evolution G(t)
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