Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black hole motion in Euclidean space as a diffusion process   A diffusion equation for a black hole is derived from the Bunster-Carlip
equations. Its solution has the standard form of a Gaussian distribution. The
second moment of the distribution determines the quantum of black hole area.
The entropy of diffusion process is the same, apart from the logarithmic
corrections, as the Bekenstein-Hawking entropy.

19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-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
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn