منابع مشابه
Sp-brane accelerating cosmologies
We investigate time dependent solutions (S-brane solutions) for product manifolds consisting of factor spaces where only one of them is non-Ricci-flat. Our model contains minimally coupled free scalar field as a matter source. We discuss a possibility of generating late time acceleration of the Universe. The analysis is performed in conformally related Brans-Dicke and Einstein frames. Dynamical...
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...
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In two recent papers Randall and Sundrum [1,2] have shown that a scenario with an infinite fifth dimension in the presence of a brane can generate a theory of gravity which mimics purely four-dimensional gravity, both with respect to the classical gravitational potential and with respect to gravitational radiation. The gravitational self-couplings are not significantly modified in this model. T...
متن کاملBrane Cosmologies without Orbifolds
We study the dynamics of branes in configurations where 1) the brane is the edge of a single anti-de Sitter space and 2) the brane is the surface of a vacuum bubble in an asymptotically flat space-time. In both cases we find solutions that resemble the standard Robertson-Walker cosmologies although in the latter, the evolution is not controlled by matter on the brane, but by the five-dimensiona...
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,...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2006
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.73.104016