Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-singular and ghost-free infinite derivative gravity with torsion   We present the most general quadratic curvature action with torsion including
infinite covariant derivatives and study its implications around the Minkowski
background via the Palatini approach. Provided the torsion is solely given by
the background axial field, the metric and torsion are shown to decouple, and
both of them can be made ghost and singularity free for a fermionic source.

15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph