期刊
CLASSICAL AND QUANTUM GRAVITY
卷 21, 期 18, 页码 4383-4397出版社
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/21/18/007
关键词
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An exponential potential of the form V similar to exp(-2cphi/M-p) arising from the hyperbolic or flux compactification of higher-dimensional theories is of interest for getting short periods of accelerated cosmological expansions. Using a similar potential but derived for the combined case of hyperbolic-flux compactification, we study the four-dimensional flat (and open) FLRW cosmologies and give analytic (and numerical) solutions with exponential behaviour of scale factors. We show that, for the M-theory motivated potentials, the cosmic acceleration of the universe can be eternal if the spatial curvature of the 4d spacetime is negative, while the acceleration is only transient for a spatially flat universe. We also briefly comment on the size of the internal space and its associated geometric bounds on massive Kaluza-Klein excitations.
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