Results 81 to 90 of about 281 (174)

Life on a closed timelike curve

Classical and Quantum Gravity
Abstract We study the internal dynamics of a hypothetical spaceship traveling on a close timelike curve in an axially symmetric Universe. We choose the curve so that the generator of evolution in proper time is the angular momentum. Using Wigner’s theorem, we prove that the energy levels internal to the spaceship must undergo spontaneous
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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.
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Timelike surfaces with Bertrand geodesic curves in Minkowski 3–space

AIP Advances
Geodesic curves on a surface play an essential role in reasonable implementation. A curve on a surface is a geodesic curve if its principal normal vector is aligned with the surface normal. Using the Serret–Frenet frame, the timelike (TL) surfaces can be
A. A. Almoneef, R. A. Abdel-Baky
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Entropic interpretation of Einstein equation in dS/CFT

Journal of High Energy Physics
In this paper, we demonstrate that the first law of holographic pseudo-entropy, which is a non-Hermitian generalization of entanglement entropy in a two-dimensional conformal field theory (CFT), is equivalent to the perturbative Einstein equation in ...
Kosei Fujiki, Michitaka Kohara, Kotaro Shinmyo, Yu-ki Suzuki, Tadashi Takayanagi   +4 more
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Quantum fields on timelike curves

, 2000
56 ...
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Pseudo-timelike loops in signature changing semi-Riemannian manifolds with a transverse radical

Results in Physics
In 1983, Hartle and Hawking proposed the no-boundary proposal, suggesting that the universe has no beginning in the sense of a spacetime singularity or boundary. Nevertheless, there is an origin of time.
N.E. Rieger, W. Hasse
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Lorentzian Structure and Curvature Analysis of Osculating Type-2 Ruled Surfaces via the Type-2 Bishop Frame

Mathematics
This study investigates the geometry of osculating type-2 ruled surfaces in Minkowski 3-space E13, formulated through the Type-2 Bishop frame associated with a spacelike curve whose principal normal is timelike and binormal is spacelike.
Mohammed Messaoudi, Emad Solouma, Mohammed N. Alshehri, Abdulrahman F. Aljohani, Marin Marin   +4 more
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Geometric Decomposition of Force and Yank for Variable-Mass Systems in Minkowski 3-Space

Axioms
We develop a differential-geometric framework for variable-mass particles moving along non-lightlike curves with non-vanishing curvature in Minkowski 3-space E13, employing the Frenet–Serret apparatus adapted to a Lorentzian signature.
Fatimah Alghamdi, Ayman Elsharkawy
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The bound orbits and gravitational waveforms of timelike particles around renormalization group improved Kerr black holes

European Physical Journal C: Particles and Fields
In this article, we investigate the bound orbits of the timelike particles and the gravitational waveforms emitted from these orbits around a renormalization group improved Kerr black hole in the framework of the asymptotic safety approach.
Yong-Zhuang Li, Xiao-Mei Kuang
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MINKOWSKI 3-UZAYINDA TİMELİKE EĞRİNİN BİSHOP ÇATISI

Süleyman Demirel Üniversitesi Fen-Edebiyat Fakültesi Fen Dergisi, 2009
Biz bu çalışmada, BISHOP (1975) tarafından elde edilen sonucu, Minkowski 3- uzayında timelike eğriler için çalıştık. İlaveten, timelike eğriler için Darboux vectörü(matrisi) bulundu.
Bahaddin BÜKCÜ, Murat Kemal KARACAN
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