Results 21 to 30 of about 156,624 (168)
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
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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
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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
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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
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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.
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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
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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
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Conical Kähler–Einstein Metrics Revisited
Communications in Mathematical Physics, 2014 In this paper we introduce the "interpolation-degneration" strategy to study Kahler-Einstein metrics on a smooth Fano manifold with cone singularities along a smooth divisor that is proportional to the anti-canonical divisor. By "interpolation" we show the angles in $(0, 2 ]$ that admit a conical Kahler-Einstein metric form an interval; and by ...
Li, Chi, Sun, Song
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Second Chern-Einstein metrics on four-dimensional almost-Hermitian manifolds
Complex Manifolds, 2023 We study four-dimensional second Chern-Einstein almost-Hermitian manifolds. In the compact case, we observe that under a certain hypothesis, the Riemannian dual of the Lee form is a Killing vector field.
Barbaro Giuseppe, Lejmi Mehdi
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