Closed time-like curves in flat Lorentz space–times
نویسندگان
چکیده
منابع مشابه
Closed Timelike Curves in Flat Lorentz Spacetimes
We consider the region of closed timelike curves (CTC’s) in three-dimensional flat Lorentz spacetimes. The interest in this global geometrical feature goes beyond the purely mathematical. Such spacetimes may be considered lower-dimensional toy models of sourceless Einstein gravity or cosmology. In three dimensions all such spacetimes are known: they are quotients of Minkowski space by a suitabl...
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We formulate QFT on a R/Z2 orbifold, in a manner which is invariant under the Z2 time and space reversal. This is a background with closed time-like curves. It is also relevant for the elliptic interpretation of de Sitter space. We calculate the one-loop vacuum expectation value of the stress tensor in the invariant QFT, and show that it does not diverge at the boundary of the region of closed ...
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Three simple examples illustrate properties of path integral amplitudes in fixed background spacetimes with closed timelike curves: non-relativistic potential scatter
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Closed Time-like curves (CTC) in Cosmic strings in teleparallel T4 gravity are forbidden.This result shown here in T4 was shown by Soleng (Phys.Rev.D49 (1994)1124) also to be valid in Einstein-Cartan (EC) gravity.Here we show that in T4 to allow for CTC we are also led to a lower bound on the angular momentum of the cosmic string.This result is obtained by matching the interior T4 solution to a...
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In an analysis of the gravitational lensing by two relativistic cosmic strings, we argue that the formation of closed time-like curves proposed by Gott is unstable in the presence of particles (e.g. the cosmic microwave background radiation). Due to the attractor-like behavior of the closed time-like curve, we argue that this instability is very generic. A single graviton or photon in the vicin...
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ژورنال
عنوان ژورنال: Journal of Geometry and Physics
سال: 2003
ISSN: 0393-0440
DOI: 10.1016/s0393-0440(02)00153-5