Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Torsion Fields in Higher Derivative Quantum Gravity   We consider axial torsion fields which appear in higher derivative quantum
gravity. It is shown, in general, that the torsion field possesses states with
two spins, one and zero, with different masses. The first-order formulation of
torsion fields is performed. Projection operators extracting pure spin and mass
states are given. We obtain the Lagrangian in the framework of the first order
formalism and energy-momentum tensor. The effective interaction of torsion
fields with electromagnetic fields is discussed. The Hamiltonian form of the
first order torsion field equation is given.

33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio