ar X iv : 0 71 1 . 45 13 v 1 [ gr - q c ] 2 8 N ov 2 00 7 Conformal classes of asymptotically flat , static vacuum data

Fiber-optical analogue of the event horizon: Appendices

We explain the theory behind our fiber-optical analogue of the event horizon and present the experiment in detail. 1 ar X iv :0 71 1. 47 97 v1 [ gr -q c] 2 9 N ov 2 00 7

ar X iv : 0 71 1 . 25 73 v 1 [ gr - q c ] 1 6 N ov 2 00 7 Spinning particles in scalar - tensor gravity

We develop a new model of a spinning particle in Brans-Dicke space-time using a metric-compatible connection with torsion. The particle's spin vector is shown to be Fermi-parallel (by the Levi-Civita connection) along its worldline (an autoparallel of the metric-compatible connection) when neglecting spin-curvature coupling.

ar X iv : 0 80 8 . 08 80 v 1 [ gr - q c ] 6 A ug 2 00 8 Ricci flows , wormholes and critical phenomena

We study the evolution of wormhole geometries under Ricci flow using numerical methods. Depending on values of initial data parameters, wormhole throats either pinch off or evolve to a monotonically growing state. The transition between these two behaviors exhibits a from of critical phenomena reminiscent of that observed in gravitational collapse. Similar results are obtained for initial data ...

ar X iv : 0 80 8 . 24 81 v 1 [ he p - th ] 1 8 A ug 2 00 8 MIFP - 08 - 21 USTC - ICTS - 08 - 14 AdS

We obtain a large class of smooth Lorentzian p-brane wormholes in supergravities in various dimensions. They connect two asymptotically flat spacetimes. In cases where there is no dilaton involved in the solution, the wormhole can connect an AdSn × Sm in one asymptotic region to a flat spacetime in the other. We obtain explicit examples for (n,m) = (4, 7), (7, 4), (5, 5), (3, 3), (3, 2). These ...

ar X iv : 0 71 2 . 38 38 v 3 [ gr - q c ] 3 1 M ay 2 00 8 General Transformation Formulas for Fermi - Walker Coordinates