5,800 research outputs found
Hawking Radiation from Squashed Kaluza-Klein Black Holes -- A Window to Extra Dimensions --
We explore the obsevability of extra dimensions through 5-dimensional
squashed Kaluza-Klein black holes residing in the Kaluza-Klein spacetime. With
the expectation that the Hawking radiation reflects the 5-dimensional nature of
the squashed horizon, we study the Hawking radiation of a scalar field in the
squashed black hole background. As a result, we show that the luminosity of
Hawking radiation tells us the size of the extra dimension, namely, the
squashed Kaluza-Klein black holes open a window to extra dimensions.Comment: 4pages, 2figure
Instability of Small Lovelock Black Holes in Even-dimensions
We study the stability of static black holes in Lovelock theory which is a
natural higher dimensional generalization of Einstein theory. We derive a
master equation for tensor perturbations in general Lovelock theory. It turns
out that the resultant equation is characterized by one functional which
determines the background black hole solutions. Thus, the stability issue of
static black holes under tensor perturbations in general dimensions is reduced
to an algebraic problem. We show that small Lovelock black holes in
even-dimensions are unstable.Comment: 14 pages, 2 figure
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