Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Higher-dimensional evolving wormholes satisfying the null energy
  condition   In this work, we consider the possibility of expanding wormholes in
higher-dimensions, which is an important ingredient of modern theories of
fundamental physics. An important motivation is that non-trivial topological
objects such as microscopic wormholes may have been enlarged to macroscopic
sizes in an expanding inflationary cosmological background. Since the Ricci
scalar is only a function of time in standard cosmological models, we use this
property as a simplifying assumption. More specifically, we consider a
particular class of wormhole solutions corresponding to the choice of a
spatially homogeneous Ricci scalar. The possibility of obtaining solutions with
normal and exotic matter is explored and we find a variety of solutions
including those in four dimensions that satisfy the null energy condition (NEC)
in specific time intervals. In particular, for five dimensions, we find
solutions that satisfy the NEC throughout the respective evolution.

13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph