Frühere Oberseminare
Wintersemester 2023/2024
In der Regel findet das Oberseminar montags um 16:15 Uhr in Präsenz statt im SRZ 214. Ausnahmen (Zoom, Mittwochstermin, andere Zeit) sind eingetragen. Falls Sie die Zugangsdaten für die Zoom-Vorträge noch nicht per Email erhalten haben, wenden Sie sich bitte an sandra.huppert@uni-muenster.de.
| Datum |
Sprecher |
Vortrag |
| 09.10.2023 |
Lorenzo Foscolo, University College London |
Yang-Mills instantons and codiemnsion-1 collapse |
| 16.10.2023 |
Klaus Kröncke, KTH Stockholm |
Scalar curvature rigdity, mass and stability of Einstein manifolds |
| 23.10.2023 |
Sven Hirsch, IAS Princeton |
On a generalization of Geroch's conjecture
via Zoom |
| 30.10.2023 |
Karin Melnick, Universität Luxembourg |
Compact, Lorentzian conformally flat manifolds |
| 06.11.2023 |
Wolfram Bauer, Universität Hannover |
Subriemannian geometry and spectral analysis |
| 13.11.2023 |
Daniele Semola, ETH Zürich |
Ricci Curvature, Fundamental Groups, and the Milnor Conjecture |
| 20.11.2023 |
Shubham Dwivedi, HU Berlin |
Geometric flows of $G_2$ - structures |
| 27.11.2023 |
Ragini Singhal, ULB Brüssel, today in M4 |
Nearly half-flat \rm{SU}{3} structures on $S³\times S³$ |
| 04.12.2023 |
Lennart Machill, Universität Münster |
Nonlinear and Linearized Models in Elasticity |
| 13.12.2023 (Mittwoch) |
Uwe Semmelmann, Universität Stuttgart |
Integrability of infinitesimal Einstein deformations on Kähler manifolds
|
| 18.12.2023 |
Jan Sbierski, University of Edinburgh |
On the uniqueness problem for extensions of Lorentzian manifolds |
| 08.01.2024 |
Francesca Oronzio, KTH University |
ADM mass and potential theory |
| 15.01.2024 |
Hartmut Weiß, Universität Kiel, today in M4 |
On the modularity of gravitational instantons of type ALG |
| 22.01.2024 |
Marko Sobak, Universität Münster [was on the 29th]
|
Haunted Einstein-Yang-Mills wormholes |
| 29.01.2024 |
Stéphanie Cupit, Universität Bochum [was on the 22nd] |
A generalisation of Sylvester's law of inertia |
Sommersemester 2023
In der Regel findet das Oberseminar montags um 16:15 Uhr in Präsenz statt im SRZ 214. Ausnahmen (Zoom, Mittwochstermin, andere Zeit) sind eingetragen. Falls Sie die Zugangsdaten für die Zoom-Vorträge noch nicht per Email erhalten haben, wenden Sie sich bitte an sandra.huppert@uni-muenster.de.
| Datum |
Sprecher |
Vortrag |
| 03.04.2023 |
Katrin Tent, Münster |
Burnside groups and iterated small cancellation theory |
| 17.04.2023 |
Izar Alonso Lorenzo, Oxford |
New examples of SU(2)^2-invariant G_2-instantons
|
| 24.04.2023 |
Nikhil Savale, Köln |
Bochner Laplacians and Bergman kernels for families
M5
|
| 08.05.2023 |
Christian Lange, München |
Regularity of billiards and geodesic flows |
| 15.05.2023 |
Dennis Wulle, Münster |
Cohomogeneity one manifolds with quasipositive curvature |
| 22.05.2023 |
Philipp Reiser, Fribourg |
Surgery and positive intermediate Ricci curvature
|
| 05.06.2023 |
Gustav Nilsson, Potsdam |
Topology of Toric Gravitational Instantons |
| 12.06.2023 |
Max Stolarski, Warwick |
On the Structure of Singularities of Mean Curvature Flows with Mean Curvature Bounds
M5
|
| 19.06.2023 |
Polyxeni Spilioti, Göttingen |
Twisted Ruelle zeta function on locally symmetric spaces, the Fried’s conjecture and further applications |
| 26.06.2023 |
Reto Buzano, Turin |
Mean curvature flow and Heegaard surfaces in lens spaces
|
| 24.07.2023 |
Izar Alonso Lorenzo, Oxford |
A non-existence result for balanced SU(3)- structures on cohomogeneity one manifolds
SRZ 214, 15 Uhr
|
| 24.07.2023 |
Francesco Pediconi, Florenz |
A moment map for twisted Hamiltonian vector fields on locally conformally Kähler manifolds
SRZ 214, 16.15 Uhr
|
Wintersemester 2022/2023
| Datum |
Sprecher |
Vortrag |
| 10.10.2022 |
Gilles Courtois (Sorbonne-Jussieu) |
Cheeger inequality for differential forms |
| 17.10.2022 |
David Tewodrose (Université de Nantes) |
Rigidity of the first Betti number under Kato bounds on the Ricci curvature |
| 24.10.2022 |
Jorgen Olsen Lye (Uni Hannover) |
Geodesics on a K3 surface near the orbifold limit
|
| 31.10.2022 |
Lothar Schiemanowski (Uni Kiel) |
Desingularization of weak holonomy conifolds and topology of
AC Calabi--Yau and G_2 manifolds |
| 07.11.2022 |
Stephen Lynch (Imperial College London) |
Uniqueness of ancient solutions to curvature flows |
| 14.11.2022 |
Antoine Song (Caltech) |
via Zoom, Beginn 17:15 Uhr, The spherical Plateau problem: uniqueness and stability for hyperbolic manifolds |
| 23.11.2022 |
Elena Mäder-Baumdicker (TU Darmstadt) |
Mittwoch 16:15 Uhr SRZ 214, Recent developments concerning the Volume Preserving Mean Curvature Flow |
| 28.11.2022 |
Frieder Jäckel (Uni Bonn) |
Stability of hyperbolic metrics, room M3 |
| 05.12.2022 |
Sebastian Goette (Uni Freiburg) |
Extra Twisted Connected Sums and their $\nu$-Invariants |
| 12.12.2022 |
Miles Simon (Uni Magdeburg) |
Initial stability estimates for Ricci flow and three dimensional Ricci-pinched manifolds |
| 19.12.2022 |
Anna Sakovich (Uppsala Universitet) |
Towards a space time intrinsic flat convergence
|
| 09.01.2023 |
Francesco Lin (Columbia University) |
Floer homology and the spectral geometry of hyperbolic three-manifolds
via Zoom, time: 4:15pm |
| 16.01.2023 |
Cristiano Spotti (Aarhus Universitet) |
Balanced Chern-Ricci flat metrics on non-Kähler small resolutions |
| 23.01.2023 |
Konstantinos Zemas (Uni Münster) |
Geometric rigidity estimates in variable domains and applications in dimension reduction |
| 30.01.2023 |
Melanie Rupflin (University of Oxford) |
Quantitative estimates for almost harmonic maps |
| 13.02.2023 |
David González Alvaro (Universidad Politécnica de Madrid) |
Positive k-th intermediate Ricci curvature on homogeneous spaces
|
Sommersemester 2022
| Datum |
Sprecher |
Vortrag |
| 04.04.2022 |
Darya Sukhorebska, ILTPE of the National Academy of Sciences of Ukraine and WWU Münster |
Simple closed geodescis on regular tetrahedra in spaces of constant curvature |
| 11.04.2022 |
Kevin Poljsak, WWU Münster |
Towards Finding the Second Best Einstein Metric in Low Dimensions |
|
25.04.2022
|
Henri Guenancia, Institut de Mathématiques de Toulouse and CNRS |
Compact Kähler manifolds with negative holomorphic sectional curvature |
| 02.05.2022 |
Victor Sanmartin Lopez, Universidad Politécnica de Madrid
|
Isoparametric hypersurfaces in symmetric spaces
|
| 09.05.2022 |
Linus Kramer, WWU Münster |
Solutions of a quadratic matrix equation
|
| 16.05.2022 |
Diego Corro, Universität zu Köln |
Yamabe type problems and singular Riemannian foliations
|
| 23.05.2022 |
Christopher Deninger, WWU Münster |
Knots, primes and periodic orbits |
| 30.05.2022 |
Jan Nienhaus, WWU Münster |
Torus actions in positive curvature |
| 13.06.2022 |
Nadine Große, Universität Freiburg |
The space of metrics with invertible Dirac operators |
| 27.06.2022 |
Ramiro Lafuente (University of Queensland)
|
Hermitian manifolds with flat Gauduchon connections |
| 04.07.2022 |
Lee Kennard, Syracuse University |
Positive curvature and elementary abelian group actions |
| 04.07.2022 |
Wilderich Tuschmann, Karlsruhe Institute of Technology |
Positive Ricci Curvature Metrics and Moduli Spaces |
| 05.07.2022 |
Renato Bettiol (CUNY) |
Extremality and rigidity for scalar curvature in dimension 4 |
Wintersemester 2021/2022
Das Oberseminar findet in diesem Semester sowohl per Zoom als auch in Präsenz statt. Beginn ist in der Regel um 16.15 Uhr, Ausnahmen sind eingetragen.
Falls Sie die Zugangsdaten (Passwort) noch nicht per Email erhalten haben, wenden Sie sich bitte an sandra.huppert@uni-muenster.de
| Datum |
Sprecher |
Vortrag |
|
| 18.10.2021 |
Jeff Viaclovsky, UC Irvine |
Gravitational instantons with quadratic volume growth |
Zoom, 17-18 Uhr |
| 25.10.2021 |
Jean Lagacé, University of Bristol |
Spectral geometry, minimal surfaces and homogenisation |
Zoom |
| 08.11.2021 |
Ved Datar, Indian Institute of Science, Bangalore |
Some rigidity theorems in Kaehler geometry |
Zoom |
| 15.11.2021 |
Jian Wang, Stony Brook University |
Topological rigidity and positive scalar curvature |
Zoom |
| 22.11.2021 |
Mayukh Mukherjee, Indian Institute of Technology, Bombay |
Billiard flow and eigenfunction concentration on polyhedra |
Zoom |
| 29.11.2021 |
Mario Schulz, WWU Münster |
Free boundary minimal surfaces |
Präsenz |
| 06.12.2021 |
Louis Ioos, MPIM Bonn |
Quantum measurement theory over projective manifolds |
Präsenz |
| 13.12.2021 |
Matthias Wink, WWU Münster |
The Bochner technique for Kähler manifolds |
Präsenz |
| 20.12.2021 |
Matan Eilat, Weizmann Institute of Technology |
Rigidity of Riemannian embeddings of discrete metric spaces |
Zoom |
| 10.01.2022 |
Vicente Cortés, Universität Hamburg |
Quaternionic Kähler manifolds fibering over the real line with fibers of finite volume |
Präsenz |
| 17.01.2022 |
Anusha Krishnan, WWU Münster |
Positive sectional curvature and Ricci flow |
Präsenz |
| 24.01.2022 |
Uwe Semmelmann, Universität Stuttgart |
Stability of Einstein metrics |
Präsenz |
| 31.01.2022 |
Gustav Holzegel, WWU Münster |
Unique Continuation for the Einstein Equations in asymptotically AdS spacetimes |
Präsenz |
Sommersemester 2021
Das Oberseminar findet in diesem Semester per Zoom statt. Beginn ist in der Regel um 16.15 Uhr, Ausnahmen sind eingetragen.
Falls Sie die Zugangsdaten (Passwort) noch nicht per Email erhalten haben, wenden Sie sich bitte an sandra.huppert@uni-muenster.de
| Datum |
Sprecher |
Vortrag |
PDF |
| 12.04.2021 |
Philipp Reiter (TU Chemnitz) |
Elastic knots |
pdf |
| 19.04.2021 |
Dorin Bucur (Université de Savoie) |
Stable and unstable spectral inequalities |
pdf |
| 26.04.2021 |
Rudolf Zeidler (WWU Münster) |
Scalar and mean curvature comparison via the Dirac operator |
pdf |
| 03.05.2021 |
Christine Breiner (Fordham) |
Harmonic maps into CAT(k) spaces |
pdf |
| 10.05.2021 |
Ursula Ludwig (Duisburg-Essen) |
Witten deformation and Cheeger-Müller theorem for singular spaces with conical singularities |
|
| 17.05.2021 |
Xiaoyang Chen (Tongji University) |
Some vanishing theorems on manifolds with almost nonnegative /nonpositive Ricci curvature
|
pdf |
| 31.05.2021 |
Rosa Sena-Dias (IST Lisboa) |
Uniqueness among scalar-flat Kähler toric metrics on non-compact surfaces |
pdf |
| 07.06.2021 |
Robin Neumayer (Northwestern) |
$d_p$ Convergence and $\epsilon$-regularity theorems for entropy and scalar curvature lower bounds |
pdf |
| 14.06.2021 |
Luca Di Cerbo (University of Florida) |
Higher Graph Manifolds and Singer Conjecture |
pdf |
| 21.06.2021 |
Ilaria Mondello (Paris Est Créteil) |
Limits of manifolds with a Kato bound on the Ricci curvature |
pdf |
| 28.06.2021 |
Karin Melnick (Maryland) |
Conformal groups of compact Lorentzian manifolds |
|
| 05.07.2021 |
Caterina Zeppieri (WWU Münster) |
Homogenisation of variational problems: an overview |
pdf |
| 12.07.2021 |
Yuguang Zhang (Hannover) |
Pair-of-pants decomposition of general type hypersurface in CP^3 |
|
| 19.07.2021 |
Andreas Gastel (Duisburg-Essen) |
Regularity questions for polyharmonic maps |
pdf |
Wintersemester 2020/2021
Das Oberseminar findet in diesem Semester per Zoom statt. Beginn ist in der Regel um 16.15 Uhr, Ausnahmen sind eingetragen.
Falls Sie die Zugangsdaten (Passwort) noch nicht per Email erhalten haben, wenden Sie sich bitte an sandra.huppert@uni-muenster.de
| Datum |
Sprecher |
Vortrag |
| 02.11.2020 |
Daniel Stern, Chicago |
Min-max harmonic maps and extremal metrics for Laplacian eigenvalues |
| 09.11.2020 |
Julian Scheuer, Cardiff |
A general approach to stability of the soap bubble theorem and related problems |
|
16.11.2020
18 Uhr s.t.
|
Guofang Wei, UCSB |
Ricci flow and $L^{n/2}$-curvature pinching |
| 23.11.2020 |
Stefano Montaldo, Cagliari |
Higher order energy functionals and polyharmonic hypersurfaces |
| 30.11.2020 |
Arthur Bartels, Münster |
Long thin covers for flows |
| 07.12.2020 |
Yang Li, MIT |
Metric SYZ conjecture |
| 14.12.2020 |
Renato Bettiol, CUNY |
Pinched 4-manifolds |
| 11.01.2021 |
Dan Lee, CUNY |
|
| 18.01.2021 |
Joel Fine, Brüssel |
Knots, minimal surfaces and J-holomorphic curves |
| 25.01.2021 |
Joeri van der Veken, Leuven |
Lagrangian submanifolds of the complex quadric |
| 01.02.2021 |
Amitai Yuval |
|
| 08.02.2021 |
Keaton Naff, Columbia |
MCF of nearly-planar submanifolds in higher codimension |
| |
Sommersemester 2020 |
|
| Datum |
Sprecher |
Vortrag |
| 11.05.2020 |
Anna Maria Fino, Turin |
Closed G_2-structures and Laplacian flow |
| 18.05.2020 |
Klaus Kröncke, Hamburg |
L^p-stability and positive scalar curvature rigidity of Ricci-flat ALE manifolds |
| 25.05.2020 |
Volker Branding, Wien |
Higher order generalizations of harmonic maps |
| 08.06.2020 |
Matthias Wink, UCLA
17-18 Uhr
|
New Curvature Conditions for the Bochner Technique |
| 15.06.2020 |
Miguel Domínguez Vázquez, Santiago de Compostela |
Cohomogeneity one actions and inhomogeneous isoparametric hypersurfaces in quaternionic hyperbolic spaces |
| 22.06.2020 |
Peter McGrath, UPenn |
Quantitative Isoperimetric Inequalities on Riemannian Surfaces |
| 29.06.2020 |
Tristan Ozuch-Meersseman, ENS Paris |
Noncollapsed degeneration of Einstein 4-manifolds |
| 06.07.2020 |
Shih-Kia Chiu, Notre Dame |
A Liouville type theorem for harmonic 1-forms |
| |
Wintersemester 2019/2020 |
|
| Datum |
Sprecher |
Vortrag |
| 07.10.2019 |
Jason Lotay, Oxford |
Minimal submanifolds, mean curvature flow and the Gibbons-Hawking ansatz |
| 14.10.2019 |
Fernando Galaz-Garcia, KIT |
On quotients of spaces with Ricci curvature bounded below |
| 21.10.2019 |
Elena Mäder-Baumdicker, Darmstadt |
Willmore spheres are unstable |
| 28.10.2019 |
Reto Buzano, Turin |
Bubbling analysis for closed and free-boundary minimal hypersurfaces |
| 04.11.2019 |
Lorenzo Foscolo, Edinburgh |
Complete non-compact Spin(7)-manifolds from self-dual Einstein 4-orbifolds |
| 11.11.2019 |
Thomas Richard, Université Paris-Est Créteil |
Synthetic curvature bounds on stratified spaces |
| 18.11.2019 |
Panagiotis Gianniotis, Athen |
Regularity theory for Type I Ricci flows |
| 25.11.2019 |
Francesco Di Giovanni, London |
The Ricci flow of warped Berger metrics |
| 02.12.2019 |
Michael Weiß, Münster |
The diffeomorphism group of an exotic sphere |
| 09.12.2019 |
Manuel Amann, Augsburg |
Non-negatively curved vector bundles over cohomogeneity one manifolds |
| 16.12.2019 |
Alix Deruelle, Paris |
A Lojasiewicz inequality for ALE Ricci flat metrics |
| 13.01.2020 |
Huy Nguyen, London |
High Codimension Mean Curvature Flow and Surgery |
| 20.01.2020 |
Fabian Lehmann, London |
Cohomogeneity one families in Spin(7) geometry |
|
27.01.2020
14.30 -15.30 Uhr, SR2
|
Maximilian Stegemeyer, Würzburg |
Endpoint geodesics in extrinsic symmetric spaces |
|
27.01.2020
16-18 Uhr, SR4
|
Jason Ledwidge, Tübingen |
The structure of non-compact shrinking Ricci solitons via heat kernel estimates |
| |
Sommersemester 2019 |
|
| Datum |
Sprecher |
Vortrag |
| 08.04.2019 |
Jian Wang, Grenoble |
Contractible 3-manifolds and positive scalar curvature |
| 15.04.2019 |
Angela Stevens, Münster |
Homogenization of the heat equation in periodically layered domains |
| 29.04.2019 |
Marco Freibert, Kiel |
The spinor flow on homogeneous manifolds |
| 06.05.2019 |
Miles Simon, Magdeburg |
On the regularity of Ricci flows coming out of metric spaces |
| 13.05.2019 |
Benedikt Wirth, Münster |
Variational models for transportation networks: weak-* relaxation and flat chains |
| 20.05.2019 |
Nina Lebedeva, St. Petersburg |
Spaces with weak lower curvature bound |
| 27.05.2019 |
Jiawei Liu, Magdeburg |
Stability of the Conical Kähler-Ricci flows on Fano manifolds |
| 03.06.2019 |
Kevin Poljsak, Münster |
Convergence behaviour of the curvature tensor for a converging Ricci flow |
| 17.06.2019 |
Niels Martin Møller, Kopenhagen |
Forgetful classifications of ancient mean curvature flows |
| 08.07.2019 |
Jan Nienhaus, Münster |
Spaces with periodic cohomology rings |
| |
Wintersemester 2018/2019 |
|
| Datum |
Sprecher |
Vortrag |
| 15.10.2018 |
Joel Fine, Brüssel |
Examples of compact Einstein 4-manifolds with negative curvature |
| 22.10.2018 |
Bernhard Hanke, Augsburg |
Local flexibility for open partial differential relations |
| 29.10.2018 |
Stephan Stadler, München |
A Morse lemma for quasiplanes |
| 05.11.2018 |
Ricardo Mendes, Köln |
Diameter of quotients of the sphere by isometric group actions |
| 12.11.2018 |
Olaf Müller, Berlin |
New conformal methods at the interface of analysis, geometry and mathematical physics |
| 19.11.2018 |
Stefan Suhr, Bochum |
A min-max characterization of Zoll metrics |
| 26.11.2018 |
Guofang Wang, Freiburg |
A new Minkowsky formula for free boundary hypersurfaces |
| 03.12.2018 |
Christian Lange, Köln |
Existence of infinitely many closed geodesics on closed 2-orbifolds |
| 10.12.2018 |
Jan Swoboda, München |
Analysis and geometry of Higgs bundle moduli spaces |
| 17.12.2018 |
Christian Ketterer, Toronto |
Metric measure spaces with 2-sided curvature bounds |
| 07.01.2019 |
Ernst Kuwert, Freiburg |
The total squared curvature functional for 2-dimensional surfaces in Riemannian manifolds |
| 14.01.2019 |
Peter Albers, Heidelberg |
Symplectic billiards |
| 21.01.2019 |
Johannes Ebert, Münster |
Diffeomorphism groups and the space of metrics of positive scalar curvature |
| 28.01.2019 |
Oliver Goertsches, Marburg |
Geometric structures on biquotients |
| |
Sommersemester 2018 |
|
| Datum |
Sprecher |
Vortrag |
| 09.04.2018 |
Norman Zergänge, Warwick |
Convergence of Riemannian 4-manifolds with L^2 -curvature bounds |
| 16.04.2018 |
Viveca Erlandsson, Bristol |
Counting curves on surfaces |
| 23.04.2018 |
Klaus Kröncke, Hamburg |
Stability of ALE Ricci-flat manifolds under Ricci flow |
| 30.04.2018 |
Mauricio Bustamante, Augsburg |
Bundles with fiberwise negatively curved metrics |
| 07.05.2018 |
Manuel Amann, Augsburg |
Orbifolds with all geodesics closed |
| 14.05.2018 |
Franziska Beitz, Münster |
Bianchi-convex functions and rigidity of shrinking gradient Ricci solitons |
| 28.05.2018 |
Boris Vertman, Oldenburg |
Stability of the Ricci de Turck flow on singular spaces |
| 04.06.2018 |
Anand Dessai, Fribourg |
Moduli space of metrics of nonnegative sectional/positive Ricci curvature on homotopy real projective spaces |
| 18.06.2018 |
Marco Radeschi, Notre Dame |
Manifolds submetries, and polynomial algebras |
| 25.06.2018 |
Anda Degeratu, Stuttgart |
Towards a construction of constant scalar curvature Kähler metrics on elliptic surfaces |
| 02.07.2018 |
Anton Petrunin, PSU |
Convergence of curvature tensor |
| 09.07.2018 |
Wilderich Tuschmann, Karlsruhe |
Spaces of nonnegatively curved metrics |
| 18.07.2018 |
Ronan Conlon, Miami |
New examples of complete Calabi-Yau metrics on n for |
| |
Wintersemester 2017/2018 |
|
| Datum |
Sprecher, Universität |
Titel |
| 09.10.2017 |
Nina Lebedeva, WWU Münster |
On optimal transport continuity property |
| 16.10.2017 |
Julian Scheuer, Universität Freiburg |
Harnack inequalities for evolving hypersurfaces |
| 23.10.2017 |
Huy Nguyen, Queen Mary University London |
Singularity formation in high codimension mean curvature flow |
| 30.10.2017 |
Daniele Valtorta, Universität Zürich |
Singularities for Q-valued Dirichlet minimizing functions |
| 06.11.2017 |
Bogdan Georgiev, Universität Bonn |
Some estimates on the geometry of Laplacian eigenfunctions |
| 13.11.2017 |
Fernando Galaz Garcia, KIT |
Sufficiently collapsed irreducible Alexandrov spaces are geometric |
| 20.11.2017 |
Chao Qian, WWU Münster |
The story of isoparametric foliation: From unit spheres to exotic spheres |
| 27.11.2017 |
Martin Kell, Universität Tübingen |
Group actions on spaces with Ricci curvature bounded below |
| 04.12.2017 |
Luigi Vezzoni, Universität Turin |
A quantitative version of a theorem of Alexandrov |
| 11.12.2017 |
Tobias Lamm, KIT |
Expanders for the harmonic map flow |
| 18.12.2017 |
Henrik Matthiesen, MPI Bonn |
The analytic systole of Riemannian surfaces |
| 15.01.2018 |
Artem Nepechiy, Münster |
New convex functions on Alexandrov spaces |
| 22.01.2018 |
Saskia Roos, MPI Bonn |
The Dirac operator under codimension one collapse |
| 29.01.2018 |
Matthias Wink, Oxford |
Constructions of complete Ricci solitons of cohomogeneity one |
