Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-07-11
JHEP 0210 (2002) 028
Physics
High Energy Physics
High Energy Physics - Theory
43 pages, 8 figures. Published version
Scientific paper
10.1088/1126-6708/2002/10/028
We identify a time-dependent class of metrics with potential applications to cosmology, which emerge from negative-tension branes. The cosmology is based on a general class of solutions to Einstein-dilaton-Maxwell theory, presented in {hep-th/0106120}. We argue that solutions with hyperbolic or planar symmetry describe the gravitational interactions of a pair of negative-tension $q$-branes. These spacetimes are static near each brane, but become time-dependent and expanding at late epoch -- in some cases asymptotically approaching flat space. We interpret this expansion as being the spacetime's response to the branes' presence. The time-dependent regions provide explicit examples of cosmological spacetimes with past horizons and no past naked singularities. The past horizons can be interpreted as S-branes. We prove that the singularities in the static regions are repulsive to time-like geodesics, extract a cosmological `bounce' interpretation, compute the explicit charge and tension of the branes, analyse the classical stability of the solution (in particular of the horizons) and study particle production, deriving a general expression for Hawking's temperature as well as the associated entropy.
Burgess Cliff P.
Quevedo Fernando
Rey Soo-Jong
Tasinato Gianmassimo
Zavala Ivonne
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