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Covariant gravitational equations on a brane world with a Gauss-Bonnet term
We present covariant gravitational equations to describe a four-dimensional brane world in the case with a Gauss-Bonnet term in a bulk spacetime, assuming that gravity is confined on the ${Z}_{2}$Expand
$N+1$ formalism in Einstein-Gauss-Bonnet gravity
Towards the investigation of the full dynamics in a higher-dimensional and/or a stringy gravitational model, we present the basic equations of the Einstein-Gauss-Bonnet gravity theory. We show theExpand
Have we already detected astrophysical symptoms of space-time noncommutativity?
We discuss astrophysical implications of $\kappa$-Minkowski space-time, in which there appears space-time noncommutativity. We first derive a velocity formula for particles based on the motion of aExpand
Spacetime structure of static solutions in Gauss-Bonnet gravity: Neutral case
We study the spacetime structures of the static solutions in the n-dimensional Einstein-Gauss-Bonnet-{lambda} system systematically. We assume the Gauss-Bonnet coefficient {alpha} is non-negative andExpand
Scalar hair on the black hole in asymptotically anti--de Sitter spacetime
We examine the no-hair conjecture in asymptotically anti--de Sitter (AdS) spacetime. First, we consider a real scalar field as the matter field and assume static spherically symmetric spacetime.Expand
Toward the no-scalar-hair conjecture in asymptotically de Sitter spacetime
Department of Physics, Rikkyo University, Toshima-ku, Tokyo 171-8501, Japan(February 7, 2008)We discuss the no-hair conjecture in the presence of a cosmological constant. For the first stepthe realExpand
Gravitational energy, dS/CFT correspondence and cosmic no-hair
The gravitational energy is examined in asymptotically de Sitter space-times. The positivity will be shown for certain cases. The de Sitter/CFT(dS/CFT) correspondence recently proposed and cosmicExpand
Dyonic BIon black hole in string inspired model
We construct static and spherically symmetric particle-like and black hole solutions with magnetic and/or electric charge in the Einstein-Born-Infeld-dilaton-axion system, which is a generalizationExpand
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