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$f(R)$ Gravity and Crossing the Phantom Divide Barrier (1005.5679v2)
Published 31 May 2010 in gr-qc
Abstract: The $f(R)$ gravity models formulated in Einstein conformal frame are equivalent to Einstein gravity together with a minimally coupled scalar field. We shall explore phantom behavior of $f(R)$ models in this frame and compare the results with those of the usual notion of phantom scalar field.
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