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7 papers · 2 filters
Supersymmetric Intersecting Branes in Time-dependent Backgrounds
Nobuyoshi Ohta, Kamal L. Panigrahi
We construct a family of supersymmetric solutions in time-dependent backgrounds in supergravity theories. One class of the solutions are intersecting brane solutions and another cl…
Realizing Scale-invariant Density Perturbations in Low-energy Effective String Theory
Zong-Kuan Guo, Nobuyoshi Ohta, Shinji Tsujikawa
We discuss the realization of inflation and resulting cosmological perturbations in the low-energy effective string theory. In order to obtain nearly scale-invariant spectra of den…
Addendum to "Hyperbolic Space Cosmologies"
Chiang-Mei Chen, Pei-Ming Ho, Ishwaree P. Neupane +2
In our earlier paper [JHEP 0310 (2003) 058], we considered higher dimensional cosmological models with hyperbolic spaces. In particular the eternal accelerating expansion was obtai…
On the No-ghost Theorem in String Theory
Kazuyuki Furuuchi, Nobuyoshi Ohta
We give a simple proof of the no-ghost theorem in the critical bosonic string theory by using a similarity transformation.
Supersymmetric Rotating Black Hole in a Compactified Spacetime
Kei-ichi Maeda, Nobuyoshi Ohta, Makoto Tanabe
We construct a supersymmetric rotating black hole with asymptotically flat four-dimensional spacetime times a circle, by superposing an infinite number of BMPV black hole solutions…
Time-Dependent Supersymmetric Solutions in M-Theory and the Compactification-Decompactification Transition
Hideo Kodama, Nobuyoshi Ohta
We show that the diagonal light-like solution with 16 supersymmetries in eleven-dimensional supergravity derived in our previous paper (hep-th/0509173) can be generalised to non-di…