Results 31 to 40 of about 511,872 (337)
Hamiltonian actions of unipotent groups on compact K\"ahler manifolds [PDF]
Épijournal de Géométrie Algébrique, 2018 We study meromorphic actions of unipotent complex Lie groups on compact K\"ahler manifolds using moment map techniques. We introduce natural stability conditions and show that sets of semistable points are Zariski-open and admit geometric quotients that ...
Daniel Greb, Christian Miebach
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Geometric invariant theory for graded unipotent groups and applications [PDF]
Journal of Topology, 2016 Let U be a graded unipotent group over the complex numbers, in the sense that it has an extension Û by the multiplicative group such that the action of the multiplicative group by conjugation on the Lie algebra of U has all its weights strictly positive.
Gergely B'erczi +3 more
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Cocientes algebraicos y Teoría de Invariantes Geométricos
Selecciones Matemáticas, 2020 The quotient of an algebraic variety by action of an algebraic group does not always has a variety structure. The aim of this work is to describe a methodfor constructing good quotients, in the sense of Geometric invariant theory, in algebraicgeometry.
Nélida Medina García
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A Robust Image Watermarking Scheme Based on Image Normalization and Contourlet Transform
IEEE Access, 2023 It is a challenging work to solve the geometric attack in the field of digital watermarking. In order to solve the synchronization between the host image and the watermark, image normalization is introduced.
Shaobao Wu +3 more
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Journal of High Energy Physics, 2021 We take advantage of the principal bundle geometry of the space of connections to obtain general results on the presymplectic structure of two classes of (pure) gauge theories: invariant theories, and non-invariant theories satisfying two restricting ...
J. François
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Stability of the Levi-Civita tensors and an Alon–Tarsi type theorem
Comptes Rendus. Mathématique, 2023 We show that the Levi-Civita tensors are semistable in the sense of Geometric Invariant Theory, which is equivalent to an analogue of the Alon–Tarsi conjecture on Latin squares.
Yeliussizov, Damir
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Polystable bundles and representations of their automorphisms
Complex Manifolds, 2022 Using a quasi-linear version of Hodge theory, holomorphic vector bundles in a neighbourhood of a given polystable bundle on a compact Kähler manifold are shown to be (poly)stable if and only if their corresponding classes are (poly)stable in the sense of
Buchdahl Nicholas, Schumacher Georg
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Split structures in general relativity and the Kaluza-Klein theories [PDF]
, 1998 We construct a general approach to decomposition of the tangent bundle of pseudo-Riemannian manifolds into direct sums of subbundles, and the associated decomposition of geometric objects.
Frankel F. I. +11 more
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Einstein–Yang–Mills theory: gauge invariant charges and linearization instability
European Physical Journal C: Particles and Fields, 2021 We construct the gauge-invariant electric and magnetic charges in Yang–Mills theory coupled to cosmological general relativity (or any other geometric gravity), extending the flat spacetime construction of Abbott and Deser (Phys Lett B 116:259–263, 1982).
Emel Altas +2 more
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Geometric Invariant Theory for principal three-dimensional subgroups acting on flag varieties [PDF]
, 2015 Let G be a semisimple complex Lie group. In this article, we study Geometric Invariant Theory on a flag variety G/B with respect to the action of a principal 3-dimensional simple subgroup S of G.
H. Seppanen, V. Tsanov
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