Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: No stable wormholes in Einstein-dilaton-Gauss-Bonnet theory   In [P. Kanti, B. Kleihaus, J. Kunz, Phys. Rev. Lett. 107, 271101 (2011)] it
was shown that the four-dimensional Einstein-dilaton-Gauss-Bonnet theory allows
for wormholes without introducing any exotic matter. The numerical solution for
the wormhole was obtained there and it was claimed that this solution is
gravitationally stable against radial perturbations, what, by now, would mean
the only known theoretical possibility for existence of an apparently stable,
four-dimensional and asymptotically flat wormhole without exotic matter. Here,
more detailed analysis of perturbations shows that the Kanti-Kleihaus-Kunz
wormhole is unstable against small perturbations for any values of its
parameters. The exponential growth appears in the time domain after a long
period of damped oscillations, in the same way as it takes place in the case of
unstable higher-dimensional black holes in the Einstein-Gauss-Bonnet theory.
The instability is driven by the purely imaginary mode, which is
nonperturbative in the Gauss-Bonnet coupling$\alpha$.

19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th