Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wormhole throats in $R^{m}$ gravity   We consider wormhole geometries subject to a gravitational action consisting
of non-linear powers of the Ricci scalar. Specifically, wormhole throats are
studied in the case where Einstein gravity is supplemented with a Ricci-squared
and inverse Ricci term. In this modified theory it is found that static
wormhole throats respecting the weak energy condition can exist. The analysis
is done locally in the vicinity of the throat, which eliminates certain
restrictions on the models introduced by considering the global topology.

28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org