TY - JOUR

T1 - Cosmological spacetimes from negative tension brane backgrounds

AU - Burgess, Cliff P.

AU - Quevedo, Fernando

AU - Zavala C, Ivonne

AU - Rey, Soo Jong

AU - Tasinato, Gianmassimo

PY - 2002/10/1

Y1 - 2002/10/1

N2 - 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 g-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 geodesies, 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.

AB - 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 g-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 geodesies, 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.

KW - Cosmology of Theories beyond the SM

KW - p-branes

KW - Superstrings and Heterotic Strings

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U2 - 10.1088/1126-6708/2002/10/028

DO - 10.1088/1126-6708/2002/10/028

M3 - Article

AN - SCOPUS:23044507011

SN - 1029-8479

VL - 6

SP - 539

EP - 581

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 10

ER -