24,135 research outputs found
A 1+5-dimensional gravitational-wave solution: curvature singularity and spacetime singularity
We solve a -dimensional cylindrical gravitational-wave solution of the
Einstein equation, in which there are two curvature singularities. Then we show
that one of the curvature singularities can be removed by an extension of the
spacetime. The result exemplifies that the curvature singularity is not always
a spacetime singularity; in other words, the curvature singularity cannot serve
as a criterion for spacetime singularities
Scalar scattering in Schwarzschild spacetime: Integral equation method
An integral equation method for scalar scattering in Schwarzschild spacetime
is constructed. The zeroth-order and first-order scattering phase shift is
obtained
Why the entropy of spacetime is independent of species of particles -- the species problem
The Hawking radiation emits all species of particles, but the
Bekenstein-Hawking entropy is independent of the number of the species of
particles. This is the so-called species problem --- a puzzling problem for a
long time. In this paper, we suggest a solution to this problem. A result of
the scheme is that the black hole atmosphere has a mass equaling 3/8 mass of a
classical Schwarzschild black hole, which agrees with 't Hooft's brick wall
model
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