Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The entropic force between two horizons of charged Gauss-Bonnet Black
  hole in de Sitter Spacetime   The basic equations of the thermodynamic system give the relationship between
the internal energy, entropy and volume of two neighboring equilibrium states.
By using the functional relationship between the state parameters in the basic
equation, we give the differential equation satisfied by the entropy of
spacetime. We can obtain the expression of the entropy by solving the
differential equationy. This expression is the sum of entropy corresponding to
the two event horizons and the interaction term. The interaction term is a
function of the ratio of the locations of the black hole horizon and the
cosmological horizon. The entropic force, which is strikingly similar to the
Lennard-Jones force between particles, varies with the ratio of the two event
horizons. The discovery of this phenomenon makes us realize that the entropic
force between the two horizons may be one of the candidates to promote the
expansion of the universe.

23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math