Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical behavior of black-hole spacetimes   The theory of General Relativity predicts that black holes are a natural
constituent of our Universe. Before a black hole binary relaxes to a final
state, it undergoes damped oscillations which completely characterize the final
object. These oscillations are described by quasinormal modes which are present
in many dissipative systems. Quasinormal modes are linked to the way a black
hole spacetime responds to small fluctuations. Although the field equations
admit a well defined future evolution of spacetime, some black holes, like the
ones formed after a binary merger, possess a boundary, beyond which the field
equations lose their predictive power. This boundary is called a Cauchy horizon
and designates the region beyond which the spacetime can potentially be
described in a highly non-unique manner.
  Strong cosmic censorship states that, generically, suitable initial data
should be future inextendible beyond the Cauchy horizon, as a solution to the
field equations. Recent studies indicate that the fate of Cauchy horizons, such
as those found inside charged and rotating cosmological black holes, is
intrinsically connected to the decay of perturbations exterior to the event
horizon. As such, the validity of strong cosmic censorship is tied to how
effectively the exterior damps fluctuations. In this thesis we will perform a
quantitative stability analysis of Cauchy horizons in electrically charged
black holes immersed in a de Sitter Universe. We will provide strong numerical
evidence which designate that the (linear analog of) strong cosmic censorship
is violated by near-extremal Reissner-Nordstr\"om-de Sitter black holes.
Moreover, we shall investigate a superradiant instability in $d-$dimensional
Reissner-Nordstr\"om-de Sitter black holes and show that the increment of
dimensions decreases the timescale of the instability.

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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph