Results 31 to 40 of about 13,985 (193)
Unitarity with Closed Timelike Curves [PDF]
Journal of Physics: Conference Series, 2006 We conjecture that, in certain cases, quantum dynamics is consistent in the presence of closed timelike curves. We consider time dependent orbifolds of three dimensional Minkowski space describing, in the limit of large AdS radius, BTZ black holes inside the horizon.
openaire +1 more source
A comment on Bonnor–Steadman closed timelike curves [PDF]
General Relativity and Gravitation, 2008 The existence and stability closed timelike curves in a Bonnor-Ward spacetime without torsion line singularities is shown by exhibiting particular examples.
Rosa, Valéria M., Letelier, Patricio S.
openaire +3 more sources
Special helices on equiform differential geometry of timelike curves in E_1^4
Cumhuriyet Science Journal, 2021 In this paper, we introduce the moving Frenet frame along the timelike curve in E_1^4 and then Frenet formulas with the equiform parameter in the equiform geometry of the Minkowski space-time.
Fatma Bulut
doaj
Causality violation and singularities [PDF]
, 1995 We show that singularities necessarily occur when a boundary of causality violating set exists in a space-time under the physically suitable assumptions except the global causality condition in the Hawking-Penrose singularity theorems.
Akihiro Ishibashi +7 more
core +3 more sources
Journal of Function Spaces, 2018 In this paper, a class of indefinite hypersurfaces and a class of indefinite surfaces generated by timelike curves located in nullcone in 4-dimensional semi-Euclidean space with index 2 are discussed. Using the unfolding theory in singularity theory, the
Xue Song, Zhigang Wang
doaj +1 more source
Negative branes, supergroups and the signature of spacetime
Journal of High Energy Physics, 2018 We study the realization of supergroup gauge theories using negative branes in string theory. We show that negative branes are intimately connected with the possibility of timelike compactification and exotic spacetime signatures previously studied by ...
Robbert Dijkgraaf +3 more
doaj +1 more source
Tangent and trinormal spherical images of a time-like curve on the pseudohyperbolic space H30; pp. 216–224 [PDF]
Proceedings of the Estonian Academy of Sciences, 2010 In this work tangent and trinormal spherical images of a time-like curve lying on the pseudohyperbolic space H30 in Minkowski space-time are investigated. We observe that the mentioned spherical images are space-like curves.
Süha Yılmaz +3 more
doaj +1 more source
Quantum Computational Complexity in the Presence of Closed Timelike Curves
, 2003 Quantum computation with quantum data that can traverse closed timelike curves represents a new physical model of computation. We argue that a model of quantum computation in the presence of closed timelike curves can be formulated which represents a ...
A. Kitaev +14 more
core +1 more source
Normal forms for sub-Lorentzian metrics supported on Engel type distributions
, 2013 We construct normal forms for Lorentzian metrics on Engel distributions under the assumption that abnormal curves are timelike future directed Hamiltonian geodesics.
Grochowski, Marek
core +1 more source
Energy-Momentum Restrictions on the Creation of Gott Time Machines [PDF]
, 1994 The discovery by Gott of a remarkably simple spacetime with closed timelike curves (CTC's) provides a tool for investigating how the creation of time machines is prevented in classical general relativity.
Carroll, Sean M. +3 more
core +2 more sources