Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geons as wormholes of modified gravity   Wormholes may arise as solutions of extensions of General Relativity without
violation of the energy conditions. Working in a Palatini approach we consider
classical geometries supporting such wormholes. It is shown that the resulting
space-times represent explicit realizations of the concept of geon introduced
by Wheeler, interpreted as self-consistent bodies generated by an
electromagnetic field without sources.

8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom