Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unimodular Gauge and ADM Gravity Path Integral   This paper proposes a definition of gravitational observables and of their
path integral formula within the framework of ADM foliation and the choice of
unimodular gauge classes. The method enforces a BRST invariant gauge fixing of
the lapse and shift fields. It yields the quantum level extension of the known
classical property that the conformal classes of internal metrics of constant
Lorentz time leafs define the gravitational physical degrees of freedom.

15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs