Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conformal symmetry wormholes and the null energy condition   In this paper we seek a relationship between the assumption of conformal
symmetry and the exotic matter needed to hold a wormhole open. By starting with
a Morris-Thorne wormhole having a constant energy density, it is shown that the
conformal factor provides the extra degree of freedom sufficient to account for
the exotic matter. The same holds for Morris-Thorne wormholes in a
noncommutative-geometry setting. Applied to thin shells, there would exist a
radius that results in a wormhole with positive surface density and negative
surface pressure and which violates the null energy condition on the thin
shell.

13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs