Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Thermodynamical Relation between Rotating Charged BTZ Black Holes
  and Effective String Theory   In this paper we study the first law of thermodynamics for the (2+1)
dimensional rotating charged BTZ black hole considering a pair of
thermodinamical systems constructed with the two horizons of this solution. We
show that these two systems are similar to the right and left movers of string
theory and that the temperature associated with the black hole is the harmonic
mean of the temperatures associated with these two systems.

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The categories of this paper are: supr-con
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom