A note on accelerating cosmologies from compactifications and S-branes
نویسندگان
چکیده
منابع مشابه
A note on accelerating cosmologies from compactifications and S-branes
We give a simple interpretation of the recent solutions for cosmologies with a transient accelerating phase obtained from compactification in hyperbolic manifolds, or from S-brane solutions of string/M-theory. In the four-dimensional picture, these solutions correspond to bouncing the radion field off its exponential potential. Acceleration occurs at the turning point, when the radion stops and...
متن کاملAccelerating Cosmologies from S-Branes
We point out that the recently proposed model of a flat 4-dimensional universe with accelerated expansion in string/M-theory is a special case of time-dependent solutions that the author found under the name of “S-branes.” We also show that similar accelerating models can be obtained from S-branes if the internal space is chosen to be hyperbolic or flat spaces. PACS numbers: 04.50.+h, 11.25.Yb,...
متن کاملAccelerating cosmologies from M/String theory compactifications
We point out that the solution of (4 + n)-dimensional gravity coupled to the dilaton and an n-form field strength can give rise to a flat 4-dimensional universe (with a scale factor) of the type proposed recently under time dependent compactifications. The compact internal spaces could be hyperbolic, flat or spherical and the solution is identical to the space-like two brane or S2-brane. We sho...
متن کاملEternally accelerating cosmologies from S-brane
We construct an eternally inflating spacelike brane world model. This model is feasible only if the space dimension of the brane is three (SM2) or six (SM5) for M theory or four (SD3) for superstring theory. A time-dependent n-form field would supply a constant energy density and cause eternal expansion of the spacelike brane. On the other hand, the hyperbolic space perpendicular to the brane w...
متن کاملNonsingular Cosmologies from Branes
We analyse possible cosmological scenarios on a brane where the brane acts as a dy-namical boundary of various black holes with anti-de Sitter or de Sitter asymptotics. In many cases, the brane is found to describe completely non-singular universe. In some cases, quantum gravity era of the brane-universe can also be avoided by properly tuning bulk parameters. We further discuss the creation of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2003
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2003/05/028