410 research outputs found
Cosmological Model in 2d Dilaton Gravity
We apply CGHS-type dilaton gravity model to (1+1)-dimensional cosmological
situations.
First the behavior of a compact 1-dimensional universe (i.e. like a closed
string) is classified on the assumption of homogeneity of universe.
Several interesting solutions are found, which include a Misner-type universe
having closed time-like curves, and an asymptotically de Sitter universe first
pointed out by Yoshimura.
In the second half of this talk, we discuss the modification of the classical
homogeneous solutions, considering inhomogeneity of classical conformal matters
and also quantum back-reaction respectively.
(An expanded version of the talk presented by T. Mishima at Yukawa Institute
of Theoretical Physics workshop `Quantum Gravity' 24-27, November 1992.)Comment: 20 pages, phyzzx, TIT/HEP-225/COSMO-3
Systematic solution-generation of five-dimensional black holes
Solitonic solution-generating methods are powerful tools to construct
nontrivial black hole solutions of the higher-dimensional Einstein equations
systematically. In five dimensions particularly, the solitonic methods can be
successfully applied to the construction of asymptotically Minkowski spacetimes
with multiple horizons. We review the solitonic methods applicable to
higher-dimensional vacuum spacetimes and present some five-dimensional examples
derived from the methods.Comment: Invited review for Prog. Theor. Phys. Suppl., 33 pages, 13 figures.
v2: References added v3: published versio
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