Titlebook: Wormholes, Warp Drives and Energy Conditions; Francisco S. N. Lobo Book 2017 Springer International Publishing AG 2017 Wormhole spacetime.

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思鄉(xiāng)病

vasculitis

Probing Faster than Light Travel and Chronology Protection with Superluminal Warp Drivester than light propagation. We shall argue that this lends support to a sort of “pre-emptive” chronology protection that forbids the generation of the very spacetime structures which could lead to the construction of time machines.

MAPLE

Wormhole Basicsnamely, one first considers an interesting and exotic spacetime metric, and then finds the matter source responsible for the respective geometry. In this manner, it was found that some of these solutions possess a peculiar property, namely “exotic matter”, involving a stress–energy tensor that viola

pulmonary

Rotating Wormholesole solutions depend on three parameters, which are associated with the size of the throat, the magnitude of the rotation and the symmetry of the two asymptotic regions. We discuss in detail the physical properties of these wormholes. We derive their global charges, including mass formulae for the s

COKE

Astrophysical Signatures of Thin Accretion Disks in Wormhole Spacetimesacetimes. More specifically, the time averaged energy flux, the disk temperature and the emission spectra of the accretion disks are obtained for these exotic geometries, and are compared with the Schwarzschild and Kerr solutions, respectively. For static and spherically symmetric wormholes it is sh

無價值

Self-Sustained Traversable Wormholesd through a variational approach with Gaussian trial wave functionals to one loop, and the graviton quantum fluctuations are interpreted as a kind of .. Since these fluctuations usually produce ultraviolet (UV) divergences, we introduce two procedures to keep them under control. The first consists o

hypertension

Trapped Ghosts as Sources for Wormholes and Regular Black Holes. The Stability Problem . whose kinetic energy is negative in a restricted (strong-field) region of space and positive outside it. This “trapped ghost” concept may in principle explain why no ghosts are observed under usual, weak-field conditions. The configurations considered are wormholes and regular black holes without

織物

Hemiparesis

Classical and Semi-classical Energy Conditionss in terms of geodesic focussing, but suffer the significant drawback that they are often violated by semi-classical quantum effects. In contrast, it is possible to develop non-standard energy conditions that are intrinsically nonlinear in the stress–energy tensor, and which exhibit much better well