Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Apparent Universe   We exploit the parallel between dynamical black holes and cosmological
spacetimes to describe the evolution of Friedmann-Lema\^itre-Robertson-Walker
universes from the point of view of an observer in terms of the dynamics of the
apparent horizon. Using the Hayward-Kodama formalism of dynamical black holes,
we clarify the role of the Clausius relation to derive the Friedmann equations
for a universe, in the spirit of Jacobson's work on the thermodynamics of
spacetime. We also show how dynamics at the horizon naturally leads to the
quantum-mechanical process of Hawking radiation. We comment on the connection
of this work with recent ideas to consider our observable Universe as a
Bose-Einstein condensate and on the corresponding role of vacuum energy.

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The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex