Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complexity of four-dimensional hairy Anti-de-Sitter black holes with a
  rotating string and shear viscosity in generalized scalar-tensor theories   In four dimensions, we consider a generalized scalar-tensor theory where the
coupling functions only depend on the kinetic term of the scalar field. For
this model, we obtain a set of hairy Anti-de-Sitter black hole solutions,
allowing us to calculate the computational complexity, according to the
Complexity equals Action conjecture. To perform this, the system contains a
particle moving on the boundary, corresponding to the insertion of a
fundamental string in the bulk. The effect string is given by the Nambu-Goto
term, analyzing the time development of this system. Together with the above,
we calculate the shear viscosity, where the viscosity/entropy density ratio can
violate the Kovtun-Son-Starinets bound for a suitable choice of coupling
functions.

2
The categories of this paper are: math
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc