Results 21 to 30 of about 3,675 (265)
Evolutionary dynamics on a regular networked structured and unstructured multi‐population
International Journal of Robust and Nonlinear Control, EarlyView., 2023 Abstract In this paper, we study collective decision‐making in a multi‐population framework, where groups of individuals represent whole populations that interact by means of a regular network. Each group consists of a number of players and every player can choose between two options.
Wouter Baar +2 more
wiley +1 more source
On Minimal Hypersurfaces of a Unit Sphere
Mathematics, 2021 Minimal compact hypersurface in the unit sphere Sn+1 having squared length of shape operator A22), provided the scalar curvature τ is a constant on integral curves of w.
Amira Ishan +3 more
doaj +1 more source
Quantum geodesic flows and curvature [PDF]
, 2023 We study geodesics flows on curved quantum Riemannian geometries using a recent formulation in terms of bimodule connections and completely positive maps. We complete this formalism with a canonical operation on noncommutative vector fields. We show on a
Edwin Beggs
core +3 more sources
European Physical Journal C: Particles and Fields, 2021 We consider the geodesic deviation equation, describing the relative accelerations of nearby particles, and the Raychaudhuri equation, giving the evolution of the kinematical quantities associated with deformations (expansion, shear and rotation) in the ...
Jin-Zhao Yang +3 more
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European Physical Journal C: Particles and Fields, 2023 The solutions to the Euler–Poisson equations are geodesic lines of SO(3) manifold with the metric determined by inertia tensor. However, the Poisson structure on the corresponding symplectic leaf does not depend on the inertia tensor.
Alexei A. Deriglazov
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Conformal Symmetries of the Strumia–Tetradis’ Metric
Physical Sciences Forum, 2023 In a recent paper, a new conformally flat metric was introduced, describing an expanding scalar field in a spherically symmetric geometry. The spacetime can be interpreted as a Schwarzschild-like model with an apparent horizon surrounding the curvature ...
Pantelis S. Apostolopoulos +1 more
doaj +1 more source
Geodesic vector fields, induced contact structures and tightness in dimension three
Geometriae DedicataAbstractIn this paper, we provide new and simpler proofs of two theorems of Gluck and Harrison on contact structures induced by great circle or line fibrations. Furthermore, we prove that a geodesic vector field whose Jacobi tensor is parallel along flow lines (e.g.
Becker, Tilman
openaire +4 more sources
Active contours based on weighted gradient vector flow and balloon forces for medical image segmentation [PDF]
, 2014 Active contours, or snakes, have been widely used for image segmentation purposes. However, high noise sensitivity and poor performance over weak edges are the most acute issues that hinder the segmentation accuracy of these curves, particularly in ...
Victor Sanchez +5 more
core +1 more source
Geodesics and Killing vector fields on the tangent sphere bundle [PDF]
Nagoya Mathematical Journal, 1998 Abstract.We show that any Killing vector field on the unit tangent sphere bundle with Sasaki metric of a space of constant curvaturek≠ 1 is fiber preserving by studying some property of geodesies on the bundle. As a consequence, any Killing vector field on the unit tangent sphere bundle of a space of constant curvaturek≠ 1 can be extended to a Killing ...
Konno, Tatsuo, Tanno, Shukichi
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SciPost Physics, 2021 We study the Killing vectors of the quantum ground-state manifold of a parameter-dependent Hamiltonian. We find that the manifold may have symmetries that are not visible at the level of the Hamiltonian and that different quantum phases of matter ...
Diego Liska, Vladimir Gritsev
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