Where new gravitational physics comes from: M-theory?

Abstract

It is suggested \cite{CDTT} that current cosmic acceleration arises due to modification of General Relativity by the terms with negative powers of curvature. We show that time-dependent (hyperbolic) compactifications of string/M-theory lead to the effective 4d gravity which naturally contains such terms. The same may be achieved in braneworld by the proper choice of the boundary action. Hence, such a model which seems to eliminate the need for dark energy may have the origin in M-theory.

LaTeX file, 14 pages, minor changes, version to appear in PLB

References in corpus (1)

• A note on accelerating cosmologies from compactifications and S-branes

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