Bibliographies thématiques / Cohomogeneity

Littérature scientifique sur le sujet « Cohomogeneity »

Auteur : Grafiati

Publié le 10 mars 2023

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Sommaire

Articles de revues
Thèses
Livres
Chapitres de livres
Actes de conférences
Rapports d'organisations

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Cohomogeneity ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "Cohomogeneity"

DANCER, ANDREW, et ANDREW SWANN. « QUATERNIONIC KAHLER MANIFOLDS OF COHOMOGENEITY ONE ». International Journal of Mathematics 10, n^o 05 (août 1999) : 541–70. http://dx.doi.org/10.1142/s0129167x99000215.

Texte intégral

Résumé :

Classification results are given for (i) compact quaternionic Kähler manifolds with a cohomogeneity-one action of a semi-simple group, (ii) certain complete hyperKähler manifolds with a cohomogeneity-two action of a semi-simple group preserving each complex structure, (iii) compact 3-Sasakian manifolds which are cohomogeneity one with respect to a group of 3-Sasakian symmetries. Information is also obtained about non-compact quaternionic Kähler manifolds of cohomogeneity one and the cohomogeneity of adjoint orbits in complex semi-simple Lie algebras.

Styles APA, Harvard, Vancouver, ISO, etc.

Deng, Shaoqiang, et Jifu Li. « Some cohomogeneity one Einstein–Randers metrics on 4-manifolds ». International Journal of Geometric Methods in Modern Physics 14, n^o 03 (14 février 2017) : 1750044. http://dx.doi.org/10.1142/s021988781750044x.

Texte intégral

Résumé :

The Page metric on [Formula: see text] is a cohomogeneity one Einstein–Riemannian metric, and is the only known cohomogeneity one Einstein–Riemannian metric on compact [Formula: see text]-manifolds. It has been a long standing problem whether there exists another cohomogeneity one Einstein–Riemannian metric on [Formula: see text]-manifolds. In this paper, we construct some examples of cohomogeneity one Einstein–Randers metrics on simply connected 4-manifolds. This shows that, although cohomogeneity one Einstein–Riemmian 4-manifolds are rare, non-Riemannian examples may exist at large.

Styles APA, Harvard, Vancouver, ISO, etc.

Li, Jifu, Zhiguang Hu et Shaoqiang Deng. « Cohomogeneity One Randers Metrics ». Canadian Mathematical Bulletin 59, n^o 3 (1 septembre 2016) : 575–84. http://dx.doi.org/10.4153/cmb-2015-009-5.

Texte intégral

Résumé :

AbstractAn action of a Lie group G on a smooth manifold M is called cohomogeneity one if the orbit space M/G is of dimension 1. A Finsler metric F on M is called invariant if F is invariant under the action of G. In this paper, we study invariant Randers metrics on cohomogeneity one manifolds. We first give a sufficient and necessary condition for the existence of invariant Randers metrics on cohomogeneity one manifolds. Then we obtain some results on invariant Killing vector fields on the cohomogeneity one manifolds and use them to deduce some sufficient and necessary conditions for a cohomogeneity one Randers metric to be Einstein.

Styles APA, Harvard, Vancouver, ISO, etc.

Galaz-García, Fernando, et Masoumeh Zarei. « Cohomogeneity one Alexandrov spaces in low dimensions ». Annals of Global Analysis and Geometry 58, n^o 2 (7 juillet 2020) : 109–46. http://dx.doi.org/10.1007/s10455-020-09716-7.

Texte intégral

Résumé :

Abstract Alexandrov spaces are complete length spaces with a lower curvature bound in the triangle comparison sense. When they are equipped with an effective isometric action of a compact Lie group with one-dimensional orbit space, they are said to be of cohomogeneity one. Well-known examples include cohomogeneity-one Riemannian manifolds with a uniform lower sectional curvature bound; such spaces are of interest in the context of non-negative and positive sectional curvature. In the present article we classify closed, simply connected cohomogeneity-one Alexandrov spaces in dimensions 5, 6 and 7. This yields, in combination with previous results for manifolds and Alexandrov spaces, a complete classification of closed, simply connected cohomogeneity-one Alexandrov spaces in dimensions at most 7.

Styles APA, Harvard, Vancouver, ISO, etc.

Julio-Batalla, Jurgen, et Jimmy Petean. « Nodal solutions of Yamabe-type equations on positive Ricci curvature manifolds ». Proceedings of the American Mathematical Society 149, n^o 10 (23 juillet 2021) : 4419–29. http://dx.doi.org/10.1090/proc/15548.

Texte intégral

Résumé :

We consider a closed cohomogeneity one Riemannian manifold ( M n , g ) (M^n,g) of dimension n ≥ 3 n\geq 3 . If the Ricci curvature of M M is positive, we prove the existence of infinite nodal solutions for equations of the form − Δ g u + λ u = λ u q -\Delta _g u + \lambda u = \lambda u^q with λ > 0 \lambda >0 , q > 1 q>1 . In particular for a positive Einstein manifold which is of cohomogeneity one or fibers over a cohomogeneity one Einstein manifold we prove the existence of infinite nodal solutions for the Yamabe equation, with a prescribed number of connected components of its nodal domain.

Styles APA, Harvard, Vancouver, ISO, etc.

Díaz-Ramos, José Carlos, Miguel Domínguez-Vázquez et Alberto Rodríguez-Vázquez. « Homogeneous and inhomogeneous isoparametric hypersurfaces in rank one symmetric spaces ». Journal für die reine und angewandte Mathematik (Crelles Journal) 2021, n^o 779 (17 août 2021) : 189–222. http://dx.doi.org/10.1515/crelle-2021-0043.

Texte intégral

Résumé :

Abstract We conclude the classification of cohomogeneity one actions on symmetric spaces of rank one by classifying cohomogeneity one actions on quaternionic hyperbolic spaces up to orbit equivalence. As a by-product of our proof, we produce uncountably many examples of inhomogeneous isoparametric families of hypersurfaces with constant principal curvatures in quaternionic hyperbolic spaces.

Styles APA, Harvard, Vancouver, ISO, etc.

Cleyton, Richard, et Andrew Swann. « Cohomogeneity-one G2-structures ». Journal of Geometry and Physics 44, n^o 2-3 (décembre 2002) : 202–20. http://dx.doi.org/10.1016/s0393-0440(02)00074-8.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Galaz-Garcia, Fernando, et Catherine Searle. « Cohomogeneity one Alexandrov spaces ». Transformation Groups 16, n^o 1 (16 février 2011) : 91–107. http://dx.doi.org/10.1007/s00031-011-9122-0.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

AHMADI, P., et S. M. B. KASHANI. « Cohomogeneity one Minkowski space Rn1 ». Publicationes Mathematicae Debrecen 78, n^o 1 (1 janvier 2011) : 49–59. http://dx.doi.org/10.5486/pmd.2011.4392.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Dancer, Andrew, et Andrew Swann. « Hyperkähler metrics of cohomogeneity one ». Journal of Geometry and Physics 21, n^o 3 (février 1997) : 218–30. http://dx.doi.org/10.1016/s0393-0440(96)00017-4.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Thèses sur le sujet "Cohomogeneity"

Betancourt, de la Parra Alejandro. « Cohomogeneity one Ricci solitons ». Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:8f924daf-d6e6-4150-96c2-d156a6a7815a.

Texte intégral

Résumé :

In this work we study the cohomogeneity one Ricci soliton equation viewed as a dynamical system. We are particularly interested in the relation between integrability of the associated system and the existence of explicit, closed form solutions of the soliton equation. The contents are organized as follows. The first chapter is an introduction to Ricci ow and Ricci solitons and their basic properties. We reformulate the rotationally symmetric Ricci soliton equation on Rn+1 as a system of ODE's following the treatment in [14]. In Chapter 2 we carry out a Painlevé analysis of the previous system. For the steady case, dimensions where n is a perfect square are singled out. The cases n = 4, 9 are particularly distinguished. In the expanding case, only dimension n = 1 is singled out. In Chapter 3 we reformulate the cohomogeneity one Ricci soliton equation as a Hamiltonian system with constraint. We obtain a conserved quantity for this system and produce explicit formulas for solitons of dimension 5. In Chapter 4 we introduce the notion of superpotential and use it to produce more explicit formulas for solitons of steady, expanding and shrinking type. In Chapter 5 we carry out a Painlevé anaylsis of the Hamiltonian corresponding to solitons over warped products of Einstein manifolds with positive scalar curvature. This analysis singles out the cases discussed in the previous chapters. We also carry out an analysis of the Hamiltonian corresponding to the Bérard Bergery ansatz [5]. This analysis singles out a 1-parameter family of solutions.

Styles APA, Harvard, Vancouver, ISO, etc.

Kudzin, Matthew. « Cohomogeneity one manifolds of non-negative curvature ». [Bloomington, Ind.] : Indiana University, 2004. http://wwwlib.umi.com/dissertations/fullcit/3162245.

Texte intégral

Résumé :

Thesis (Ph.D.)--Indiana University, Dept. of Mathematics, 2004.
Title from PDF t.p. (viewed Dec. 1, 2008). Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0307. Chair: Ji-Ping Sha.

Styles APA, Harvard, Vancouver, ISO, etc.

Chiru, Eduard. « Harmonic 2-forms on cohomogeneity one 4-manifolds ». [Bloomington, Ind.] : Indiana University, 2005. http://wwwlib.umi.com/dissertations/fullcit/3204303.

Texte intégral

Résumé :

Thesis (Ph.D.)--Indiana University, Dept. of Mathematics, 2005.
Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0300. Adviser: Ji-Ping Sha. "Title from dissertation home page (viewed Feb. 21, 2007)."

Styles APA, Harvard, Vancouver, ISO, etc.

Hassani, Masoud. « Study of cohomogeneity one three dimensional Einstein universe ». Thesis, Avignon, 2018. http://www.theses.fr/2018AVIG0421/document.

Texte intégral

Résumé :

Dans cette thèse des actions conformes de cohomogénéité un sur l'univers d'Einstein tridimensionel sont classifiées. Notre stratégie est d'établir dans un premier temps quel peut être le groupe de transformations conformes impliqué, à conjugaison près. Nous décrivons aussi la topologie et la nature causale des orbites d'une telle action
In this thesis, the conformal actions of cohomogeneity one on the three-dimensional Einstein universe are classified. Our strategy in this study is to determine the representation of the acting group in the group of conformal transformations of Einstein universe up to conjugacy. Also, we describe the topology and the causal character of the orbits induced by cohomogeneity one actions in Einstein universe

Styles APA, Harvard, Vancouver, ISO, etc.

Frank, Philipp [Verfasser], et Burkhard [Akademischer Betreuer] Wilking. « Cohomogeneity one manifolds with positive Euler characteristic / Philipp Frank. Betreuer : Burkhard Wilking ». Münster : Universitäts- und Landesbibliothek der Westfälischen Wilhelms-Universität, 2011. http://d-nb.info/1027017088/34.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Grieger, Elisabeth Sarah Francis. « On heat kernel methods and curvature asymptotics for certain cohomogeneity one Riemannian manifolds ». Thesis, King's College London (University of London), 2016. http://kclpure.kcl.ac.uk/portal/en/theses/on-heat-kernel-methods-and-curvature-asymptotics-for-certain-cohomogeneity-one-riemannian-manifolds(40d2e3ab-3eb8-4141-bcc5-ca38e0705f65).html.

Texte intégral

Résumé :

We study problems related to the metric of a Riemannian manifold with a particular focus on certain cohomogeneity one metrics. In Chapter 2 we study a set of cohomogeneity one Einstein metrics found by A. Dancer and M. Wang. We express these in terms of elementary functions and nd explicit sectional curvature formulae which are then used to determine sectional curvature asymptotics of the metrics. In Chapter 3 we construct a non-standard parametrix for the heat kernel on a product manifold with multiply warped Riemannian metric. The special feature of this parametrix is that it separates the contribution of the warping functions and the heat data on the factors; this cannot be achieved via the standard approach. In Chapter 4 we determine explicit formulae for the resolvent symbols associated with the Laplace Beltrami operator over a closed Riemannian manifold and apply these to motivate an alternative method for computing heat trace coecients. This method is entirely based on local computations and to illustrate this we recover geometric formulae for the heat coecients. Furthermore one can derive topological identities via this approach; to demonstrate this application we nd explicit formulae for the resolvent symbols associated with Laplace operators on a Riemann surface and recover the Riemann-Roch formula. In the nal chapter we report on an area of current research: we introduce a class of symbols for pseudodi erential operators on simple warped products which is closed under composition. We then extend the canonical trace to this setting, using a cut - o integral, and nd an explicit formula for the extension in terms of integrals over the factor.

Styles APA, Harvard, Vancouver, ISO, etc.

Buzano, Maria. « Topics in Ricci flow with symmetry ». Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:36df458b-b7cc-4447-a979-6adb24ff7959.

Texte intégral

Résumé :

In this thesis, we study the Ricci flow and Ricci soliton equations on Riemannian manifolds which admit a certain degree of symmetry. More precisely, we investigate the Ricci soliton equation on connected Riemannian manifolds, which carry a cohomogeneity one action by a compact Lie group of isometries, and the Ricci flow equation for invariant metrics on a certain class of compact and connected homogeneous spaces. In the first case, we prove that the initial value problem for a cohomogeneity one gradient Ricci soliton around a singular orbit of the group action always has a solution, under a technical assumption. However, this solution is in general not unique. This is a generalisation of the analogous result for the Einstein equation, which was proved by Eschenburg and Wang in their paper "Initial value problem for cohomogeneity one Einstein metrics". In the second case, by studying the corresponding system of nonlinear ODEs, we identify a class of singular behaviours for the homogeneous Ricci flow on these spaces. The singular behaviours that we find all correspond to type I singularities, which are modelled on rigid shrinking solitons. In the case where the isotropy representation decomposes into two invariant irreducible inequivalent summands, we also investigate the existence of ancient solutions and relate this to the existence and non existence of invariant Einstein metrics. Furthermore, in this special case, we also allow the initial metric to be pseudo- Riemannian and we investigate the existence of immortal solutions. Finally, we study the behaviour of the scalar curvature for this more general situation and show that in the Riemannian case it always has to turn positive in finite time, if it was negative initially. By contrast, in the pseudo-Riemannian case, there are certain initial conditions which preserve negativity of the scalar curvature.

Styles APA, Harvard, Vancouver, ISO, etc.

Reidegeld, Frank [Verfasser]. « Spin(7)-manifolds of cohomogeneity one / vorgelegt von Frank Reidegeld ». 2008. http://d-nb.info/99762549X/34.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Panelli, Francesco. « Representations admitting a toric reduction ». Doctoral thesis, 2018. http://hdl.handle.net/2158/1118268.

Texte intégral

Résumé :

We study representations (G,V), where G is a compact and connected Lie group acting by isometries on the finite dimensional real euclidean vector space V, such that the orbit space V/G is isometric to the orbit spave W/H of a representation (H,W) where H is a finite extension of a torus. In particular we classify such representations (G,V) when G is simple.

Styles APA, Harvard, Vancouver, ISO, etc.

Livres sur le sujet "Cohomogeneity"

Compact connected lie transformation groups on spheres with low cohomogeneity, I. Providence, R.I : American Mathematical Society, 1996.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Straume, Eldar. Compact connected Lie transformation groups on spheres with low cohomogeneity, II. Providence, R.I : American Mathematical Society, 1997.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Chapitres de livres sur le sujet "Cohomogeneity"

Alexandrino, Marcos M., et Renato G. Bettiol. « Low Cohomogeneity Actions and Positive Curvature ». Dans Lie Groups and Geometric Aspects of Isometric Actions, 139–83. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16613-1_6.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Ziller, Wolfgang. « On the Geometry of Cohomogeneity One Manifolds with Positive Curvature ». Dans Riemannian Topology and Geometric Structures on Manifolds, 233–62. Boston, MA : Birkhäuser Boston, 2009. http://dx.doi.org/10.1007/978-0-8176-4743-8_10.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Dancer, Andrews, et Ian A. B. Strachan. « Cohomogeneity-One Kähler Metrics ». Dans twistor theory, 9–28. Routledge, 2017. http://dx.doi.org/10.1201/9780203734889-2.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Conti, Diego, Thomas Bruun Madsen et Simon Salamon. « Quaternionic Geometry in Dimension 8 ». Dans Geometry and Physics : Volume I, 91–114. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198802013.003.0005.

Texte intégral

Résumé :

This chapter describes the 8-dimensional Wolf spaces as cohomogeneity one SU(3)-manifolds, and discover perturbations of the quaternion-kähler metric on the simply connected 8-manifold G₂/SO(4) that carry a closed fundamental 4-form but are not Einstein.

Styles APA, Harvard, Vancouver, ISO, etc.

Tod, K. P. « Cohomogeneity-One Metrics with Self-Dual Weyl Tensor ». Dans twistor theory, 171–84. Routledge, 2017. http://dx.doi.org/10.1201/9780203734889-13.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Eschenburg, J. H., et Mckenzie Y. Wang. « The ODE System Arising from Cohomogeneity One Einstein Metrics ». Dans Geometry and physics, 157–65. CRC Press, 2021. http://dx.doi.org/10.1201/9781003072393-10.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "Cohomogeneity"

Dancer, Andrew, Mckenzie Y. Wang, Carlos Herdeiro et Roger Picken. « Cohomogeneity one Ricci solitons ». Dans XIX INTERNATIONAL FALL WORKSHOP ON GEOMETRY AND PHYSICS. AIP, 2011. http://dx.doi.org/10.1063/1.3599132.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

KASHANI, S. M. B. « ON COHOMOGENEITY ONE RIEMANNIAN MANIFOLDS ». Dans Proceedings of the Summer School. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812810571_0010.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Jorge, Rogério, Ednilton S. de Oliveira et Jorge V. Rocha. « Superradiance of rotating cohomogeneity-1 black holes : Scalar case ». Dans Proceedings of the MG14 Meeting on General Relativity. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813226609_0187.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Díaz-Ramos, José Carlos. « THE ORBITS OF COHOMOGENEITY ONE ACTIONS ON COMPLEX HYPERBOLIC SPACES ». Dans Proceedings of the VIII International Colloquium. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814261173_0014.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

HASHIMOTO, Kaname. « ON THE CONSTRUCTION OF COHOMOGENEITY ONE SPECIAL LAGRANGIAN SUBMANIFOLDS IN THE COTANGENT BUNDLE OF THE SPHERE ». Dans Proceedings of the International Workshop in Honor of S Maeda's 60th Birthday. WORLD SCIENTIFIC, 2013. http://dx.doi.org/10.1142/9789814566285_0013.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Rapports d'organisations sur le sujet "Cohomogeneity"

Mirzaei, Reza. Cohomogeneity Two Riemannian Manifolds of Non-Positive Curvature. GIQ, 2012. http://dx.doi.org/10.7546/giq-13-2012-233-244.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

R. Mirzaie. Topological Properties of Some Cohomogeneity on Riemannian Manifolds of Nonpositive Curvature. GIQ, 2012. http://dx.doi.org/10.7546/giq-3-2002-351-359.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Abreu, Miguel. Toric Kähler Metrics : Cohomogeneity One Examples of Constant Scalar Curvature in Action- Angle Coordinates. GIQ, 2012. http://dx.doi.org/10.7546/giq-11-2010-11-41.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Abreu, Miguel. Toric Kähler Metrics : Cohomogeneity One Examples of Constant Scalar Curvature in Action-Angle Coordinates. Journal of Geometry and Symmetry in Physics, 2012. http://dx.doi.org/10.7546/jgsp-17-2010-1-33.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!