Results 61 to 70 of about 183 (137)

Unitarity restoration in the presence of closed timelike curves [PDF]

Physical Review D, 1995
LaTeX, 17pp, Revisions: Title change, expanded and clarified presentation of original proposal, esp.
openaire   +3 more sources

Exact spinning Morris–Thorne wormhole: causal structure, shadows, and multipole moments

European Physical Journal C: Particles and Fields
We construct an exact spinning generalisation of the Morris–Thorne traversable wormhole supported by an anisotropic fluid. Within the Teo wormhole ansatz with unit lapse and Morris–Thorne shape function, we solve analytically for the frame-dragging ...
Davide Batic, Denys Dutykh, Mark Essa Sukaiti   +2 more
doaj   +1 more source

Simple quantum systems in spacetimes with closed timelike curves [PDF]

Physical Review D, 1992
Three simple examples illustrate properties of path integral amplitudes in fixed background spacetimes with closed timelike curves: non-relativistic potential scattering in the Born approximation is non-unitary, but both an example with hard spheres and the exact solution of a totally discrete model are unitary.
openaire   +4 more sources

Rotating Topological Stars

Journal of High Energy Physics
We construct a three-parameter family of smooth and horizonless rotating solutions of Einstein-Maxwell theory with Chern-Simons term in five dimensions and discuss their stringy origin in terms of three-charge brane systems in Type IIB and M-theory.
Massimo Bianchi, Giuseppe Dibitetto, Jose F. Morales, Alejandro Ruipérez   +3 more
doaj   +1 more source

Stability of closed timelike curves in the Gödel universe

General Relativity and Gravitation, 2007
We study, in some detail, the linear stability of closed timelike curves in the Goedel metric. We show that these curves are stable. We present a simple extension (deformation) of the Goedel metric that contains a class of closed timelike curves similar to the ones associated to the original Goedel metric.
Rosa, Valéria M., Letelier, Patricio S.
openaire   +3 more sources

The fermionic double smeared null energy condition

SciPost Physics Core
Energy conditions are crucial for understanding why exotic phenomena such as traversable wormholes and closed timelike curves remain elusive. In this paper, we prove the Double Smeared Null Energy Condition (DSNEC) for the fermionic free theory in 4 ...
Duarte Fragoso, Lihan Guo
doaj   +1 more source

Hyperbolic angles in Lorentzian length spaces and timelike curvature bounds. [PDF]

J Lond Math Soc, 2023
Beran T, Sämann C.
europepmc   +1 more source

Closed timelike curves in 𝒫𝒯-symmetric wormholes

International Journal of Modern Physics D
In this paper, we investigate a modified Einstein–Rosen wormhole model, made unidirectionally traversable through a bimetric geometry defined by two regular metrics, [Formula: see text] and [Formula: see text] and characterized by [Formula: see text] symmetry combining time reversal ([Formula: see text]) and spatial inversion ([Formula: see text]). In
openaire   +2 more sources

Quantum Mechanics and Closed Timelike Curves

, 2007
General relativity allows solutions exhibiting closed timelike curves. Time travel generates paradoxes and quantum mechanics generalizations were proposed to solve those paradoxes. The implications of self-consistent interactions on acausal region of space-time are investigated.
openaire   +2 more sources

Spinning particle geometries in AdS3/CFT2

Journal of High Energy Physics
We study spinning particle/defect geometries in the context of AdS3/CFT2. These solutions lie below the BTZ threshold, and can be obtained from identifications of AdS3.
Ziyi Li
doaj   +1 more source