Results 31 to 40 of about 2,493 (230)
Metric algebroids, para-Hermitian structures and T-duality [PDF]
, 2021 The geometry of para-Hermitian vector bundles is introduced and generalised metrics are defined on such vector bundles. In particular, the properties of Born metrics are demonstrated.
Marotta, Vincenzo Emilio
core
Dynamics of finite dimensional non-hermitian systems with indefinite metric [PDF]
, 2021 We discuss the time evolution of physical finite dimensional systems which are modelled by non-hermitian Hamiltonians. We address both general non-hermitian Hamiltonians and pseudo-hermitian ones.
Ramírez, Romina Andrea, Reboiro, Marta
core
Quantum metric and wave packets at exceptional points in non-Hermitian systems [PDF]
, 2021 This is an accepted manuscript of an article published by the American Physical Society in Physical Review B on 11/03/2021, available online: https://doi.org/10.1103/PhysRevB.103.125302 The accepted version of the publication may differ from the final ...
Nalitov, A. +16 more
core +1 more source
Explicit doubly-hermitian metrics
Differential Geometry and its Applications, 1999 The author constructs examples of four-dimensional Riemannian manifolds admitting two independent compatible Hermitian structures. Here, compatible means same orientation.
openaire +2 more sources
Pluriclosed star split Hermitian metrics
Mathematische Zeitschrift, 2023 We introduce a class of Hermitian metrics, that we call pluriclosed star split, generalising both the astheno-Kähler metrics of Jost and Yau and the $(n-2)$-Gauduchon metrics of Fu-Wang-Wu on complex manifolds. They have links with Gauduchon and balanced metrics through the properties of a smooth function associated with any Hermitian metric.
openaire +4 more sources
A maximum principle for Hermitian (and other) metrics [PDF]
Proceedings of the American Mathematical Society, 2015 We consider homomorphisms of hermitian holomorphic Hilbert bundles. Assuming the homomorphism decreases curvature, we prove that its pointwise norm is plurisubharmonic.
openaire +2 more sources
Advanced Science, EarlyView.Photonic time crystals (PTCs) are systems in which electromagnetic parameters are modulated periodically in time, producing momentum bandgaps via temporal scattering rather than spatial Bragg processes. This review examines the theoretical frameworks, modeling, and computational tools for time‐varying media, and summarizes experimental demonstrations ...
Ranjan Kumar Patel +3 more
wiley +1 more source
TANGENT BUNDLE ENDOWED WITH QUARTER-SYMMETRIC NON-METRIC CONNECTION ON AN ALMOST HERMITIAN MANIFOLD [PDF]
, 2020 In this paper, we have studied the tangent bundle endowed with quarter-symmetric non-metric connection obtained by vertical and complete lifts of a quarter-symmetric non-metric connection on the base manifold and, also, proposed the study of the tangent ...
Khan, Mohammad Nazrul Islam
core +1 more source
Field‐Frustrated Cooperative Distortions: Suppressing Jahn‐Teller Ordering via Microwave Annealing
Advanced Science, EarlyView.Microwave annealing decouples local Jahn‐Teller distortions from long‐range cooperative ordering in CuFe2O4, stabilizing a metastable cubic phase that remains locally distorted yet globally symmetry‐frustrated. Synchrotron XRD, PDF, XPS, and in situ thermal cycling reveal how non‐equilibrium MW‐phonon interactions suppress cooperative orbital‐lattice ...
Daryoosh Vashaee, Kelvin Dsouza
wiley +1 more source
Conformal Reconfigurable Intelligent Surfaces: A Cylindrical Geometry Perspective
Advanced Electronic Materials, EarlyView.Cylindrical reconfigurable intelligent surfaces are explored for low‐complexity beam steering using one‐bit meta‐atoms. A multi‐level modeling approach, including optimization‐based synthesis, demonstrates that even minimal hardware can support directive scattering.
Filippo Pepe +4 more
wiley +1 more source