Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new geometrical approach to metric-affine gravity   Here we consider a metric-affine theory of gravity in which the gravitational
Lagrangian is the scalar curvature. The matter action is allowed to depend also
on the torsion and the nonmetricity, which are considered as the field
variables together with the metric. We find the field equations of the theory
and show that they reduce to Einstein equations in vacuum

31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con