Results 21 to 30 of about 157,174 (281)
Einstein-Weyl structures corresponding to diagonal K\"ahler Bianchi IX metrics [PDF]
, 1996 We analyse in a systematic way the four dimensionnal Einstein-Weyl spaces equipped with a diagonal K\"ahler Bianchi IX metric. In particular, we show that the subclass of Einstein-Weyl structures with a constant conformal scalar curvature is the one with
Bergshoef E +25 more
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Generalization of instanton-induced inflation and dynamical compactification
Journal of High Energy Physics, 2023 It was shown that Yang-Mills instantons on an internal space can trigger the expansion of our four-dimensional universe as well as the dynamical compactification of the internal space.
Jeongwon Ho +3 more
doaj +1 more source
Homogeneous Einstein metrics and butterflies
Annals of Global Analysis and Geometry, 2023 M.~M.~Graev associated in \cite{Gr} to a compact homogeneous space $G/H$ a nerve $\XGH$, whose non-contractibility implies the existence of a $G$-invariant Einstein metric on $G/H$. The nerve $\XGH$ is a compact semi-algebraic set, defined purely Lie theoretically by intermediate subgroups. In this paper we present a detailed description of the work of
Christoph Böhm, Megan M. Kerr
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Multiply Warped Products with a Semisymmetric Metric Connection
Abstract and Applied Analysis, 2014 We study the Einstein multiply warped products with a semisymmetric metric connection and the multiply warped products with a semisymmetric metric connection with constant scalar curvature, and we apply our results to generalized Robertson-Walker space ...
Yong Wang
doaj +1 more source
Dust content solutions for the Alcubierre warp drive spacetime
European Physical Journal C: Particles and Fields, 2020 The Alcubierre metric is a spacetime geometry where a massive particle inside a spacetime distortion, called warp bubble, is able to travel at velocities arbitrarily higher than the velocity of light, a feature known as the warp drive.
Osvaldo L. Santos-Pereira +2 more
doaj +1 more source
The cosmology of quadratic torsionful gravity
European Physical Journal C: Particles and Fields, 2021 We study the cosmology of a quadratic metric-compatible torsionful gravity theory in the presence of a perfect hyperfluid. The gravitational action is an extension of the Einstein–Cartan theory given by the usual Einstein–Hilbert contribution plus all ...
Damianos Iosifidis, Lucrezia Ravera
doaj +1 more source
Low regularity Poincaré–Einstein metrics
Proceedings of the American Mathematical Society, 2017 We prove the existence of a C 1 , 1 C^{1,1} conformally compact Einstein metric on the ball that has asymptotic sectional curvature decay to − 1 -1 plus terms of order e − 2 r e^{-2r}
Bahuaud, Eric, Lee, John M.
openaire +3 more sources
On Zermelo's navigation problem and weighted Einstein Randers metrics [PDF]
AUT Journal of Mathematics and ComputingThis paper investigates a specific form of weighted Ricci curvature known as the quasi-Einstein metric. Two Finsler metrics, $F$ and $\tilde{F}$ are considered, which are generated by navigation representations $(h, W)$ and $(F, V)$, respectively, where $
Illatra Khamonezhad +2 more
doaj +1 more source
Kobayashi—Hitchin correspondence for twisted vector bundles
Complex Manifolds, 2021 We prove the Kobayashi—Hitchin correspondence and the approximate Kobayashi—Hitchin correspondence for twisted holomorphic vector bundles on compact Kähler manifolds.
Perego Arvid
doaj +1 more source
Sasakian metric as a Ricci soliton and related results [PDF]
, 2013 We prove the following results: (i) A Sasakian metric as a non-trivial Ricci soliton is null $\eta$-Einstein, and expanding. Such a characterization permits to identify the Sasakian metric on the Heisenberg group $\mathcal{H}^{2n+1}$ as an explicit ...
Ghosh, Amalendu, Sharma, Ramesh
core +3 more sources