Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Corrections to the Two-dimensional Gravity with External Field   We introduce an external field to calculate the quantum corrections of the 2d
gravity, via trace anomaly. We show that there are black hole type solution
even in the absence of matter field and cosmological constant. We also see that
these solutions are similar to the ones obtained from dilaton two-dimensional
gravity.

31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an