Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How General Is Holography?   In this thesis I explore the generality of the holographic principle in 2+1
(bulk) dimensions by looking at the possibility of having holographic
correspondences for non-AdS (higher-spin) spacetimes. The first part focuses on
Lobachevsky spacetimes with $\mathfrak{sl}(4,\mathbb{R})$ as well as
$\mathcal{W}^{(2)}_N$ symmetries, the asymptotic symmetry algebras and their
unitary representations. This results in a family of unitary
$\mathcal{W}^{(2)}_N$ models that can have both small and large central charge.
The focus of the second part is a possible holographic correspondence in
asymptotically flat spacetimes. This part covers limits from known AdS$_3$
results to flat space as well as a NO-GO result that forbids having flat space,
higher-spins and unitarity at the same time. In addition this part shows how to
consistently add (higher-spin) chemical potentials to flat space. As a
non-trivial check of a holographic correspondence in flat space I provide a way
to determine entanglement entropy (as well as thermal entropy of flat space
cosmologies) holographically in asymptotically flat spacetimes using Wilson
lines.

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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
3
The categories of this paper are: physics
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga