Results 41 to 50 of about 9,774 (177)

Black hole microstates from the worldsheet

Journal of High Energy Physics, 2021
Recently an exact worldsheet description of strings propagating in certain black hole microstate geometries was constructed in terms of null-gauged WZW models.
Davide Bufalini, Sergio Iguri, Nicolas Kovensky, David Turton   +3 more
doaj   +1 more source

Cylindrically Symmetric, Asymptotically Flat, Petrov Type D Spacetime with a Naked Curvature Singularity and Matter Collapse

Advances in High Energy Physics, 2017
We present a cylindrically symmetric, Petrov type D, nonexpanding, shear-free, and vorticity-free solution of Einstein’s field equations. The spacetime is asymptotically flat radially and regular everywhere except on the symmetry axis where it possesses ...
Faizuddin Ahmed
doaj   +1 more source

A type N radiation field solution with $$\Lambda <0$$ Λ<0 in a curved space-time and closed time-like curves

European Physical Journal C: Particles and Fields, 2018
An anti-de Sitter background four-dimensional type N solution of the Einstein’s field equations, is presented. The matter-energy content pure radiation field satisfies the null energy condition (NEC), and the metric is free-from curvature divergence.
Faizuddin Ahmed
doaj   +1 more source

Holography of time machines

Journal of High Energy Physics, 2022
We use holography to examine the response of interacting quantum fields to the appearance of closed timelike curves in a dynamically evolving background that initially does not contain them.
Roberto Emparan, Marija Tomašević
doaj   +1 more source

Comment on "Information flow of quantum states interacting with closed timelike curves"

, 2011
We show that recent results on the interaction of causality-respecting particles with particles on closed timelike curves derived in [Phys. Rev. A 82, 062330 (2010)] depend on ambiguous assumption about the form of the state which is inputted into the ...
Grudka, Andrzej, Klobus, Waldemar, Wojcik, Antoni   +2 more
core   +1 more source

Axially Symmetric, Asymptotically Flat Vacuum Metric with a Naked Singularity and Closed Timelike Curves

Advances in High Energy Physics, 2016
We present an axially symmetric, asymptotically flat empty space solution of the Einstein field equations containing a naked singularity. The space-time is regular everywhere except on the symmetry axis where it possesses a true curvature singularity ...
Debojit Sarma, Faizuddin Ahmed, Mahadev Patgiri   +2 more
doaj   +1 more source

Axial Symmetry Cosmological Constant Vacuum Solution of Field Equations with a Curvature Singularity, Closed Time-Like Curves, and Deviation of Geodesics

Advances in High Energy Physics, 2020
In this paper, we present a type D, nonvanishing cosmological constant, vacuum solution of Einstein’s field equations, extension of an axially symmetric, asymptotically flat vacuum metric with a curvature singularity.
Faizuddin Ahmed, Bidyut Bikash Hazarika, Debojit Sarma   +2 more
doaj   +1 more source

Warp drives and closed timelike curves

Classical and Quantum Gravity
Abstract It is commonly accepted that superluminal travel may be used to facilitate time travel. This is a purely special-relativistic argument, using the fact that for observers in two frames of reference, separated by a spacelike interval, the non-causal (spacelike) future of one observer includes part of the causal past of the other ...
Barak Shoshany, Ben Snodgrass
openaire   +2 more sources

Nonlinearity in quantum theory and closed timelike curves [PDF]

Physical Review D, 1995
17 pages plain TeX, DAMTP R/94 ...
openaire   +3 more sources

Closed Timelike Curves Re-Examined

, 2004
17 pages, 6 postscript ...
Cooperstock, F. I., Tieu, S.
openaire   +2 more sources