Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semiclassical suppression of black hole production in particle
  collisions   It is argued that the cross section for production of large black holes, for
which a semiclassical description is applicable, cannot be given by the
geometric area of the black hole horizon, as claimed recently in the
literature. Rather the production cross section in a few-particle collision is
suppressed by at least a factor exp(-I_E) with I_E being the Gibbons-Hawking
(Euclidean) action for the black hole. Thus only essentially non-classical
small black holes with mass of the order of the Planck mass can possibly be
produced in few-particle collisions at trans-Planckian energies.

20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess