Results 51 to 60 of about 906,607 (253)
On variations of arclength with Myers’s and Hawking’s theorems in Riemannian and Lorentzian geometry [PDF]
, 2018 We work through the first and second variations of arclength and discuss the rise of index forms and Jacobi fields along with their application in finding conjugate or focal points on Riemannian or Lorentzian manifolds.
Mäkelä, Toni
core +1 more source
The spectral geometry of de Sitter space in asymptotic safety
Journal of High Energy Physics, 2022 Within the functional renormalization group approach to Background Independent quantum gravity, we explore the scale dependent effective geometry of the de Sitter solution dS4.
Renata Ferrero, Martin Reuter
doaj +1 more source
Calabi–Bernstein-Type Problems in Lorentzian Geometry [PDF]
, 2017 The study of maximal hypersurfaces in Lorentzian manifolds is an interesting mathematical problem, which connects di_erential geometry, nonlinear partial di_erential equations and certain problems in mathematical relativity.
Rafael M. Rubio, Rubio, Rafael M.
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1T‐to‐2H Phase Evolution During Epitaxial Growth of Transition Metal Dichalcogenides
Advanced Materials, EarlyView.During MOCVD growth of MoS2 and WSe2, a transient metallic 1T phase emerges in early, edge‐rich, chalcogen‐deficient domains and declines as the films ultimately coalesce as 2H material. Together, experiments and ReaxFF simulations link domain size, edge stoichiometry, and vacancies to this evolution.
Andrew R. Graves +8 more
wiley +1 more source
Efficient in‐Plane Exciton Transport in a Discontinuous Layered Lead‐Bromide Perovskite
Advanced Materials, EarlyView.A new class of two‐dimensional lead‐bromide perovskite based on monovalent 4‐aminomethylbenzoic acid cations is presented, featuring a discontinuous inorganic layer. Despite the discontinuous lattice, transient photoluminescence microscopy demonstrates efficient though strongly anisotropic in‐plane exciton transport.
Raquel Utrera‐Melero +9 more
wiley +1 more source
Fracton and non-Lorentzian particle duality: gauge field couplings and geometric implications
Journal of High Energy PhysicsFractons, characterized by restricted mobility and governed by higher-moment conservation laws, represent a novel phase of matter with deep connections to tensor gauge theories and emergent gravity.
M. M. Ahmadi-Jahmani, A. Parvizi
doaj +1 more source
Synthesis of Bulk Superconducting LiNbO2 Crystals Through CaH2 Reduction
Advanced Materials, EarlyView.CaH2 reduction reconstructively transforms insulating LiNbO3 single crystals into superconducting bulk LiNbO2 with a critical temperature of Tc = 14.4 K. Scanning electron microscopy reveals large‐volume, high‐yield phase conversion. Magnetization measurements demonstrate a robust ∼ 77% Meissner shielding fraction, establishing bulk superconductivity ...
Ryan Paxson +19 more
wiley +1 more source
Lorentzian geometry and physics in Kasparov's theory [PDF]
, 2015 We study two geometric themes, Lorentzian geometry and gauge theory, from the perspective of Connes’ noncommutative geometry and (the unbounded version of) Kasparov’s KK-theory.
Van Den Dungen, Koen
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Advanced Materials Interfaces, EarlyView.Interfacial charge transfer and low‐resistance interphase formation between PEO‐based polymer and Li10GeP2S12 solid electrolytes are investigated using multi‐electrode impedance spectroscopy and advanced analytical techniques such as XPS and ToF‐SIMS.
Ujjawal Sigar +6 more
wiley +1 more source
AIP Advances, 2020 Using a reverse attenuated-total-reflection geometry, we measured angle-scan fluorescence emission spectra of all-dielectric multilayer samples containing a waveguide layer doped with fluorescent dye molecules (fluorescent waveguide layer).
Byungjun Kang +5 more
doaj +1 more source