Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The ultrarelativistic limit of 2D dilaton gravity and its energy
  momentum tensor   The ultrarelativistic limit of twodimensional dilaton gravity is presented
and its associated (anti-)selfdual energy momentum tensor is derived. It is
localized on a null line, although the line element remains twice
differentiable. Relations to the Aichelburg-Sexl spacetime and constant dilaton
vacua are pointed out. Geodesics are found to be smooth for minimally coupled
test particles but non-smooth -- with a finite jump in the acceleration -- for
test particles coupled non-minimally to the dilaton. Quantization on boosted
backgrounds is discussed; no anomalous trace of the energy momentum tensor
arises and the 1-loop flux component can be adjusted to be equal to the
classical flux of the shock wave.

22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math