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Classification results for complex Riemannian foliations are obtained. For open subsets of irreducible Hermitian symmetric spaces of compact type, where one has explicit control over the curvature tensor, we completely classify such…

Differential Geometry · Mathematics 2019-05-07 Thomas Murphy , Paul-Andi Nagy

We prove a result of classification for germs of formal and convergent quasi-homogeneous foliations in C^2 with fixed separatrix. Basically, we prove that the analytical and formal class of such a foliation depend respectively only on the…

Dynamical Systems · Mathematics 2007-05-23 Y. Genzmer

We describe some of the connections between the Bieri-Neumann-Strebel-Renz invariants, the Dwyer-Fried invariants, and the cohomology support loci of a space X. Under suitable hypotheses, the geometric and homological finiteness properties…

Group Theory · Mathematics 2014-10-14 Alexander I. Suciu

In this article, we show that for any deformation of analytic foliations, there exists a maximal analytic singular foliation on the space of parameters along the leaves of which the deformation is integrable.

Dynamical Systems · Mathematics 2016-10-20 Yohann Genzmer

For a singular Riemannian foliation whose leaves are properly embedded, we show in the first part of this article the existence of global tubular neighbourhoods, and we develop a global description of the foliation as stratification by…

Differential Geometry · Mathematics 2008-12-18 Eva Nowak

We prove that there are only finitely many isoparametrically foliated closed connected Riemannian manifolds with bounded geometry, fixed dimension $n\neq5$, and finite fundamental group, up to foliated diffeomorphism. In addition, we…

Differential Geometry · Mathematics 2026-03-24 Manuel Krannich , Alexander Lytchak , Marco Radeschi

A singular foliation on a complete riemannian manifold M is said to be riemannian if each geodesic that is perpendicular at one point to a leaf remains perpendicular to every leaf it meets. We prove that the regular leaves are equifocal,…

Differential Geometry · Mathematics 2011-02-01 Marcos M. Alexandrino , Dirk Toeben

An orbit-like foliation is a singular foliation on a complete Riemannian manifold $M$ whose leaves are locally equidistant (i.e., a singular Riemannian foliation) and (transversely) infinitesimally homogenous. This class of singular…

Differential Geometry · Mathematics 2021-11-29 Marcos M. Alexandrino , Leonardo F. Cavenaghi

Let $(G,g)$ be a 4-dimensional Riemannian Lie group with a 2-dimensional left-invariant, conformal foliation $\F$ with minimal leaves. Let $J$ be an almost Hermitian structure on $G$ adapted to the foliation $\F$. We classify such…

Differential Geometry · Mathematics 2022-01-12 Emma Andersdotter Svensson , Sigmundur Gudmundsson

We extend the classical theory of sphere theorems to the transverse geometry of Riemannian foliations. In this setting, we establish transverse analogues of the Grove-Shiohama diameter sphere theorem and of the Berger-Klingenberg…

Differential Geometry · Mathematics 2026-03-17 Francisco C. Caramello , Francisco A. Neubauer

We introduce a class of special geometries associated to the choice of a differential graded algebra contained in \Lambda R^n. We generalize some known embedding results, that effectively characterize the real analytic Riemannian manifolds…

Differential Geometry · Mathematics 2011-08-12 Diego Conti

The present paper is a continuation of [13], [14] of the authors. Specifically, the paper considers the MD5-foliations associated to connected and simply connected MD5-groups such that their Lie algebras have 4-dimensional commutative…

Differential Geometry · Mathematics 2015-05-13 Le Anh Vu , Duong Quang Hoa

Let $(M,g)$ be an asymptotically hyperbolic manifold with a smooth conformal compactification. We establish a general correspondence between semilinear elliptic equations of scalar curvature type on $\del M$ and Weingarten foliations in…

Differential Geometry · Mathematics 2007-10-12 Rafe Mazzeo , Frank Pacard

We show how a quasi-smooth derived enhancement of a Deligne-Mumford stack X naturally endows X with a functorial perfect obstruction theory in the sense of Behrend-Fantechi. This result is then applied to moduli of maps and perfect…

Algebraic Geometry · Mathematics 2011-11-07 Timo Schürg , Bertrand Toën , Gabriele Vezzosi

We develop variation formulas on almost-product (e.g. foliated) pseudo-Riemannian manifolds, and we consider variations of metric preserving orthogonality of the distributions. These formulae are applied to Einstein-Hilbert type actions:…

Differential Geometry · Mathematics 2019-11-22 Vladimir Rovenski , Tomasz Zawadzki

We introduce conformal anti-invariant submersions from almost Hermitian manifolds onto Riemannian manifolds. We give examples, investigate the geometry of foliations which are arisen from the definition of a conformal submersion and find…

Differential Geometry · Mathematics 2015-04-23 Mehmet Akif Akyol , Bayram Sahin

A leafwise Hodge decomposition was proved by Sanguiao for Riemannian foliations of bounded geometry. Its proof is explained again in terms of our study of bounded geometry for Riemannian foliations. It is used to associate smoothing…

Differential Geometry · Mathematics 2020-01-27 Jesús A. Álvarez López , Yuri A. Kordyukov , Eric Leichtnam

We determine the structure of the fundamental group of the regular leaves of a closed singular Riemannian foliation on a compact, simply connected Riemannian manifold. We also study closed singular Riemannian foliations whose leaves are…

Differential Geometry · Mathematics 2015-06-12 Fernando Galaz-Garcia , Marco Radeschi

This work focuses on approximation and generation for the derived category of complexes with quasi-coherent cohomology on algebraic stacks. Our methods establish that approximation by compact objects descends along covers that are…

Algebraic Geometry · Mathematics 2025-05-01 Jack Hall , Alicia Lamarche , Pat Lank , Fei Peng

We extend the results of Deligne and Illusie on liftings modulo $p^2$ and decompositions of the de Rham complex in several ways. We show that for a smooth scheme $X$ over a perfect field $k$ of characteristic $p>0$, the truncations of the…

Algebraic Geometry · Mathematics 2023-03-29 Piotr Achinger , Junecue Suh