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4 papers · 2 filters
Accelerating Universes in String Theory via Field Redefinition
Kei-ichi Maeda, Nobuyoshi Ohta, Ryo Wakebe
We study cosmological solutions in the effective heterotic string theory with -correction terms in string frame. It is pointed out that the effective theory has an ambiguity vi…
Canonical Quantization for a Relativistic Neutral Scalar Field in Non-equilibrium Thermo Field Dynamics
Yuichi Mizutani, Tomohiro Inagaki, Yusuke Nakamura +1
A relativistic neutral scalar field is investigated in non-equilibrium thermo field dynamics. The canonical quantization is applied to the fields out of equilibrium. Because the th…
Oscillating Bianchi IX Universe in Horava-Lifshitz Gravity
Yosuke Misonoh, Kei-ichi Maeda, Tsutomu Kobayashi
We study a vacuum Bianchi IX universe in the context of Hořava-Lifshitz (HL) gravity. In particular, we focus on the classical dynamics of the universe and analyze how anisotropy c…
Black hole solutions in string theory
Kei-ichi Maeda, Masato Nozawa
Supersymmetric solutions of supergravity have been of particular importance in the advances of string theory. This article reviews the current status of black hole solutions in hig…