Results 81 to 90 of about 783,588 (168)

New characterization of Robertson-Walker geometries involving a single timelike curve [PDF]

Our aim in this paper is two-fold. We establish a novel geometric characterization of the Robertson–Walker (RW) spacetime and, along the process, we find a canonical form of the RW metric associated to an arbitrary timelike curve and an arbitrary space ...
Mars, Marc, Vera Jiménez, Raül, Vera, Raül   +2 more
core   +1 more source

ON THE DETERMINATION OF A DEVELOPABLE TIMELIKE RULED SURFACE

, 2008
This paper gives a method for determining a developable timelike ruled surface by using dual vector calculus. A developable timelike ruled surface can be parameterized in the form m(t, u) =p(t) + u x(t) ( p(t) is called the base curve of m(t, u) ).
Güroğlu, Ayşe Tuğba
core  

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
doaj   +1 more source

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
doaj   +1 more source

Direct quantum process characterization via erasure-based closed timelike curves

Physical Review Research
Characterizing complex quantum evolutions in the microscopic world is crucial for understanding fundamental physics and advancing quantum information applications.
Ran Yang, Gang Yang, Wei Zhou, Dong-Jie Guo, Xinhui Li, Ji-Ning Zhang, Yu Cui, Yan-Xiao Gong, Shi-Ning Zhu   +8 more
doaj   +1 more source

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
doaj   +1 more source

On Generalized Timelike Mannheim Curves in Minkowski Space-time

, 2015
Nesovic, Emilija/0000-0003-3600-0486In Minkowski space-time, timelike generalized Mannheim curves are studied by Akyigit and et al in [1]. In that paper, the authors take the Mannheim mate alpha* of the timelike curve a as a timelike curve in Minkowski ...
Ucum, Ali, Emilija Nešović, Kazim İlarslan, Ali Uçum, Ilarslan, Kazim, Nesovic, Emilija   +5 more
core   +1 more source

Generalized Smarandache curves of spacelike and equiform spacelike curves via timelike second binormal in [PDF]

, 2020
In this paper, we investigate spacelike Smarandache curves recording to the Frenet and the equiform Frenet frame of spacelike base curve with timelike second binormal vector in fourdimensional Minkowski space.
Solouma, Emad
core  

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
doaj   +1 more source

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
doaj