Cosmological spacetimes from negative tension brane backgrounds
Abstrak
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 gen- eral 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 asymptot- ically approaching ∞at space. We interpret this expansion as being the spacetime's response to the branes' presence. The time-dependent regions provide explicit examples of cosmo- logical 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.
Topik & Kata Kunci
Penulis (5)
C. Burgess
F. Quevedo
Soo-Jong Rey
G. Tasinato
I. Zavala
Akses Cepat
- Tahun Terbit
- 2002
- Bahasa
- en
- Total Sitasi
- 71×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1088/1126-6708/2002/10/028
- Akses
- Open Access ✓