Results 91 to 100 of about 58,187 (222)
Study of generalized Lemaître–Tolman–Bondi spacetime in Palatini f(R) gravity
European Physical Journal C: Particles and Fields, 2022 The objective of this paper is to investigate the continuation of Lemaître–Tolman–Bondi (LTB) space-time for dissipative dust configuration in the direction of Palatini f(R) theory.
Mutasem Z. Bani-Fwaz +4 more
doaj +1 more source
Remaining Useful Life Modelling With an Escalator Health Condition Analytic System
Quality and Reliability Engineering International, Volume 41, Issue 8, Page 3746-3758, December 2025.ABSTRACT An escalator's refurbishment is usually linked with its design life as recommended by the manufacturer. However, the actual useful life of an escalator should be determined by its operating condition, which is affected by the runtime, workload, maintenance quality and vibration, rather than age only. The objective of this project is to develop
Inez M. Zwetsloot +7 more
wiley +1 more source
On curvature tensors of Norden and metallic pseudo-Riemannian manifolds
Complex Manifolds, 2019 We study some properties of curvature tensors of Norden and, more generally, metallic pseudo-Riemannian manifolds. We introduce the notion of J-sectional and J-bisectional curvature of a metallic pseudo-Riemannian manifold (M, J, g) and study their ...
Blaga Adara M., Nannicini Antonella
doaj +1 more source
European Physical Journal C: Particles and Fields, 2021 The objective of this article is to investigate the effects of electromagnetic field on the generalization of Lemaître–Tolman–Bondi (LTB) spacetime by keeping in view the Palatini f(R) gravity and dissipative dust fluid.
M. Z. Bhatti, Z. Yousaf, F. Hussain
doaj +1 more source
Three Dimensional Gravity From SU(2) Yang-Mills Theory in Two Dimensions
, 2003 We argue that two dimensional classical SU(2) Yang-Mills theory describes the embedding of Riemann surfaces in three dimensional curved manifolds. Specifically, the Yang-Mills field strength tensor computes the Riemannian curvature tensor of the ambient ...
A. Achucarro +9 more
core +1 more source
Pseudoconformal Thermal Metamaterials Enabled by Thickness Engineering in a Single Material
Small Structures, Volume 6, Issue 12, December 2025.This work presents a geometric approach for thermal manipulation using confocally elliptical core–shell structures. Isotropic medium parameters for regulating the magnitude of the temperature gradient are obtained through pseudoconformal mapping and then approximated in sample fabrication via single‐material thickness engineering, avoiding the need for
Gaole Dai +3 more
wiley +1 more source
Curvature‐dimension condition of sub‐Riemannian α$\alpha$‐Grushin half‐spaces
Transactions of the London Mathematical Society, Volume 12, Issue 1, December 2025.Abstract We provide new examples of sub‐Riemannian manifolds with boundary equipped with a smooth measure that satisfy the RCD(K,N)$\mathsf {RCD}(K, N)$ condition. They are constructed by equipping the half‐plane, the hemisphere and the hyperbolic half‐plane with a two‐dimensional almost‐Riemannian structure and a measure that vanishes on their ...
Samuël Borza, Kenshiro Tashiro
wiley +1 more source
Remarks on Mӧller mistaken famous paper from 1943 [PDF]
Einstein field equations was originally derived by Einstein in 1915 in respect with canonical formalism of Riemann geometry,i.e. by using the classical sufficiently smooth metric tensor, smooth Riemann curvature tensor, smooth Ricci ...
Foukzon, Jaykov
core
Topological K‐theory of quasi‐BPS categories for Higgs bundles
Journal of Topology, Volume 18, Issue 4, December 2025.Abstract In a previous paper, we introduced quasi‐BPS categories for moduli stacks of semistable Higgs bundles. Under a certain condition on the rank, Euler characteristic, and weight, the quasi‐BPS categories (called BPS in this case) are noncommutative analogues of Hitchin integrable systems.
Tudor Pădurariu, Yukinobu Toda
wiley +1 more source
Einstein double field equations
European Physical Journal C: Particles and Fields, 2018 Upon treating the whole closed string massless sector as stringy graviton fields, Double Field Theory may evolve into Stringy Gravity, i.e. the stringy augmentation of General Relativity.
Stephen Angus +2 more
doaj +1 more source