Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Area-preserving Structure and Anomalies in 1+1-dimensional Quantum
  Gravity   We investigate the gauge-independent Hamiltonian formulation and the
anomalous Ward identities of a matter-induced 1+1-dimensional gravity theory
invariant under Weyl transformations and area-preserving diffeomorphisms, and
compare the results to the ones for the conventional diffeomorphism-invariant
theory. We find that, in spite of several technical differences encountered in
the analysis, the two theories are essentially equivalent.

36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics