Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-06-04
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
5 pages, no figures
Scientific paper
A classical membrane model is developed for a dynamic wormhole. Its throat
expands hyperbolically with an acceleration proportional to the surface energy
density $\sigma$. The model leads to a negative bulk viscosity coefficient
$\zeta = - 1/6 \pi$ on the throat, expressing the instability against
perturbations (expansions or contractions).
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