Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 22, Issue 5, Pages L35-L42Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/22/5/L01
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- ICREA Funding Source: Custom
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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 R-2 term (consistent modified gravity) may help to escape cosmic doomsday.
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