Results 71 to 80 of about 73,082 (280)
Einstein Manifolds As Yang-Mills Instantons
, 2013 It is well-known that Einstein gravity can be formulated as a gauge theory of Lorentz group where spin connections play a role of gauge fields and Riemann curvature tensors correspond to their field strengths.
Donaldson S. K. +6 more
core +1 more source
On Compact Trans-Sasakian Manifolds
Advances in Mathematical Physics, 2022 We study 3-dimensional compact and simply connected trans-Sasakian manifolds and find necessary and sufficient conditions under which these manifolds are homothetic to Sasakian manifolds.
Ibrahim Al-Dayel, Sharief Deshmukh
doaj +1 more source
On Compact Einstein-Kaehler Manifolds [PDF]
Proceedings of the American Mathematical Society, 1975 A characterization of a complex space form among compact Einstein-Kaehler manifolds is given in terms of Chern classes.
Koichi Ogiue, Bang-yen Chen
openaire +2 more sources
Chemistry – A European Journal, EarlyView.Photoswitchable azo ligands can be conjugated to the surface of ultrasmall gold nanoparticles with a high density (about 50 ligands on each nanoparticle). Their photoswitching is not constrained by the binding to the gold surface and can be used to induce a nematic‐to‐isotropic phase transition in a liquid crystal.
Lisa‐Sofie Wagner +7 more
wiley +1 more source
Generalized Ricci solitons and Einstein metrics on weak K-contact manifolds
Communications in Analysis and Mechanics, 2023 We study so-called "weak" metric structures on a smooth manifold, which generalize the metric contact and $ K $-contact structures and allow a new look at the classical theory.
Vladimir Rovenski
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ChemPhysChem, Volume 26, Issue 6, March 15, 2025.What happens, if in the synthesis of flat silver platelets, the slow deposition of silver along twinning faults is disturbed by the addition of a nobler metal? We have looked into it and found a way to fine‐tune the metal deposition in lateral and vertical direction.
Jonas Kluitmann +3 more
wiley +1 more source
Ambient connections realising conformal Tractor holonomy
, 2006 For a conformal manifold we introduce the notion of an ambient connection, an affine connection on an ambient manifold of the conformal manifold, possibly with torsion, and with conditions relating it to the conformal structure.
A Čap +10 more
core +3 more sources
ChemPlusChem, EarlyView.Bioglycerol, the primary byproduct of biodiesel production, has the potential to be valorized as a cosolvent in industrial formulations. Surface tension and self‐diffusion data reveal that rhamnolipid self‐aggregation in water is poorly affected by the addition of bioglycerol up to very high concentrations. These results demonstrate that biosurfactants
Rodolfo Esposito +8 more
wiley +1 more source
Some Homogeneous Einstein Manifolds [PDF]
Nagoya Mathematical Journal, 1970 Let G be a connected Lie group and H a closed subgroup with Lie algebra such that in the Lie algebra g of G there exists a subspace m with (subspace direct sum) and In this case the corresponding manifold M = G/H is called a reductive homogeneous space and (g,) (or (G,H)) a reductive pair.
openaire +3 more sources
The Einstein−Λ flow on product manifolds [PDF]
Classical and Quantum Gravity, 2016 We consider the vacuum Einstein flow with a positive cosmological constant on spatial manifolds of product form. In spatial dimension at least four we show the existence of continuous families of recollapsing models whenever at least one of the factors or admits a Riemannian Einstein metric with positive Einstein constant.
Klaus Kröncke, David Fajman
openaire +4 more sources