Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmological horizons, Noether charges and entropy   It has recently been shown that, in the vicinity of their event horizons,
black holes exhibit an infinite-dimensional symmetry. This symmetry captures
relevant physical information about the black hole, and in particular about its
thermodynamics. Here, we show that the same holds in a cosmological setup. More
precisely, we show that around the de Sitter cosmological horizon, an infinite
set of diffeomorphisms preserving a sensible set of boundary conditions
emerges. These boundary conditions are similar to those considered by Price and
Thorne in the context of the membrane paradigm, and permit to accommodate
interesting gravity solutions. As for other boundary conditions considered
previously, they are preserved by an infinite-dimensional asymptotic isometry
algebra that includes supertranslations and two copies of the Virasoro algebra.
This symmetry has associated a set of Noether charges that turn out to be
conserved, finite, and integrable. We derive these charges explicitly using the
covariant formalism and analyze their physical meaning by evaluating them to
the case of de Sitter space. In this case, the zero-mode of the charge is found
to account for the Gibbons-Hawking entropy of the cosmological horizon. We then
consider a much more general set of solutions, including asymptotically
de-Sitter black holes and asymptotically Taub-NUT-de Sitter black holes.

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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org