Consistent modified gravity: dark energy, acceleration and the absence of cosmic doomsday

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In this Subject: Nuclear Physics
By this author: M.C.B. Abdalla ;&nbsp; Shin'ichi Nojiri ;&nbsp; Sergei D. Odintsov

Authors: M.C.B. Abdalla; Shin'ichi Nojiri; Sergei D. Odintsov

Source: Classical and Quantum Gravity, Volume 22, Number 5, 7 March 2005 , pp. L35-L42(8)

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Abstract:

We discuss modified gravity which includes negative and positive powers of curvature and provides gravitational dark energy. It is shown that in GR plus a term containing a negative power of curvature, cosmic speed-up may be achieved while the effective phantom phase (with w less than -1) follows when such a term contains a fractional positive power of curvature. Minimal coupling with matter makes the situation more interesting: even 1/R theory coupled with the usual ideal fluid may describe the (effective phantom) dark energy. The account of the R² term (consistent modified gravity) may help to escape cosmic doomsday.

Document Type: Research article

DOI: http://dx.doi.org/10.1088/0264-9381/22/5/L01

Publication date: 2005-03-07