Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-06-19
Phys.Lett.B666:511-516,2008
Physics
High Energy Physics
High Energy Physics - Theory
Latex, 15 pages, reorganisation of sections, expanded discussion on accelerated time trajectories and on charged wormholes, re
Scientific paper
10.1016/j.physletb.2008.07.100
We construct stationary Ricci-flat inter-universe Lorentzian wormhole solutions in all D\ge 5 dimensions that connect two flat asymptotic spacetimes. Such a solution can be viewed as the gravity dual of a string tachyon state whose linear momentum is larger than its tension. We focus our analysis on the D=5 wormholes which are not traversable for the timelike and null geodesics; however, we demonstrate that there exist accelerated timelike trajectories that traverse from one asymptotic region to the other. We further study the minimally-coupled scalar wave equation and demonstrate that the quantum tunnelling between two worlds must occur. We also obtain charged wormholes in five-dimensional supergravities. With appropriate choice of parameters, these wormholes connect AdS$_3\times S^2$ in one asymptotic region to flat Minkowskian spacetime in the other.
Lu Hai
Mei Jian-wei
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