Results 21 to 30 of about 281 (174)
Quantum coherence and closed timelike curves [PDF]
Physical Review D, 1995 Various calculations of the $S$ matrix have shown that it seems to be non unitary for interacting fields when there are closed timelike curves. It is argued that this is because there is loss of quantum coherence caused by the fact that part of the quantum state circulates on the closed timelike curves and is not measured at infinity. A prescription is
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Closed timelike curves in superfluid 3He [PDF]
Physics Letters A, 1998 7 pages, LaTex, to appear in Phys.
Gonzalez-Diaz, Pedro F. +1 more
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Quantum avoidance of Gödel’s closed timelike curves
The European Physical Journal C, 2023 AbstractIn a large class of nonlocal as well as local higher derivative theories minimally coupled to the matter sector, we investigate the exactness of two different classes of homogeneous Gödel-type solutions, which may or may not allow closed time-like curves (CTC).
Zhao, Zhe, Modesto, Leonardo
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Transversal Intersection Curves of Two Surfaces in Minkowski 3-Space
Selecciones Matemáticas, 2018 In this paper, we study the differential geometry of the transversal intersection curve of two surfaces in Minkowski 3-space, where each pair satisfies the following types spacelike-lightlike, timelike-lightlike and lightlike-lightlike.
Osmar Alêssio +5 more
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Tubular Surfaces Around Timelike Biharmonic Curves in Lorentzian Heisenberg Group Heis3
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2012 In this paper, we describe a new method for constructing a tubular surface surrounding a timelike biharmonic curve in the Lorentzian Heisenberg group Heis3. Firstly, we characterize timelike biharmonic curves in terms of their curvature and torsion. Also,
Körpinar Talat, Turhan Essin
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Timelike rotational surfaces with lightlike profile curve
Communications Faculty Of Science University of Ankara Series A1Mathematics and Statistics, 2011 In this work, some geometric properties of the timelike rotational surfaces with lightlike profile curve of (S, L), (T,L) and (L, L) − types are shown in Minkowski 3−space.
GÜLER, Erhan, HACISALIHOĞLU H., Hilmi
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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
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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
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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
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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
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