Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quadratic curvature terms and deformed Schwarzschild-de Sitter black
  hole analogues in the laboratory   Sound waves on a fluid stream, in a de Laval nozzle, are shown to correspond
to quasinormal modes emitted by black holes that are physical solutions in a
quadratic curvature gravity with cosmological constant. Sound waves patterns in
transsonic regimes at a laboratory are employed here to provide experimental
data regarding generalized theories of gravity, comprised by the exact de
Sitter-like solution and a perturbative solution around the Schwarzschild-de
Sitter standard solution. Using the classical tests of General Relativity to
bound free parameters in these solutions, acoustic perturbations on fluid flows
in nozzles are then regarded to study quasinormal modes of these black holes
solutions, providing deviations of the de Laval nozzle cross-sectional area,
when compared to the Schwarzschild solution. The fluid sonic point in the
nozzle, for sound waves in the fluid, implements the acoustic event horizon
corresponding to quasinormal modes.

17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga