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We use cross ratios to describe second real continuous bounded cohomology for locally compact topological groups. We also derive a rigidity result for cocycles with values in the isometry group of a proper hyperbolic geodesic metric space.

Group Theory · Mathematics 2007-05-23 Ursula Hamenstaedt

We associate to an SU(2) hyperbolic monopole a holomorphic sphere embedded in projective space and use this to uncover various features of the monopole.

Differential Geometry · Mathematics 2007-05-23 Michael K. Murray , Paul Norbury , Michael A. Singer

We obtain sufficient conditions for the existence of physical/SRB measures for asymptotically sectionally hyperbolic attracting sets with any finite co-dimension, extending the co-dimension two case. We provide examples of such attractors,…

Dynamical Systems · Mathematics 2025-11-25 Vitor Araujo , Luciana Salgado

We prove that a partially hyperbolic attracting set for a C2 vector field, having slow recurrence to equilibria, supports an ergodic physical/SRB measure if, and only if, the trapping region admits non-uniform sectional expansion on a…

Dynamical Systems · Mathematics 2025-11-13 Vitor Araujo , Luciana Salgado , Sergio Sousa

It has recently been established that two-dimensional massless graphene-like systems and three-dimensional line-node topological semimetals comprise a special class of centrosymmetric materials where edge/surface states of topological…

Materials Science · Physics 2016-11-15 Ivan I. Naumov , Russell J. Hemley

We study partially hyperbolic diffeomorphisms satisfying a trapping property which makes them look as if they were Anosov at large scale. We show that, as expected, they share several properties with Anosov diffeomorphisms. We construct an…

Dynamical Systems · Mathematics 2015-02-03 Rafael Potrie

We show that a sectional-hyperbolic attracting set for a H\"older-$C^1$ vector field admits finitely many physical/SRB measures whose ergodic basins cover Lebesgue almost all points of the basin of topological attraction. In addition, these…

Dynamical Systems · Mathematics 2021-09-07 Vitor Araujo

We classify the holomorphic parabolic geometries on compact complex manifolds of general type. We accomplish this by bounding the numerical dimension of any smooth projective variety in terms of geometric invariants of the flag variety…

Differential Geometry · Mathematics 2026-01-06 Benjamin McKay

Moderately large numbers of transitive elliptic spreads are constructed in characteristic $2$ and dimension $\equiv $ 2 (mod 4).

Combinatorics · Mathematics 2015-12-04 W. M. Kantor

We develop a new method for constructing "good" designs for computer experiments. The method derives its power from its basic structure that builds large designs using small designs. We specialize the method for the construction of…

Statistics Theory · Mathematics 2010-10-05 C. Devon Lin , Derek Bingham , Randy R. Sitter , Boxin Tang

In this paper we consider expansive homeomorphisms of compact spaces with a hyperbolic metric presenting a self-similar behavior on stable and unstable sets. Several application are given related to Hausdorff dimension, entropy,…

Dynamical Systems · Mathematics 2018-01-29 Alfonso Artigue

Pugh and Shub have conjectured that essential accessibility implies ergodicity, for a $C^2$, partially hyperbolic, volume-preserving diffeomorphism. We prove this conjecture under a mild center bunching assumption, which is satsified by all…

Dynamical Systems · Mathematics 2007-05-23 Keith Burns , Amie Wilkinson

Let $M$ be a closed 3-manifold which admits an Anosov flow. In this paper we develop a technique for constructing partially hyperbolic representatives in many mapping classes of $M$. We apply this technique both in the setting of geodesic…

Dynamical Systems · Mathematics 2020-11-18 Christian Bonatti , Andrey Gogolev , Andy Hammerlindl , Rafael Potrie

We show that for a certain family of integrable reversible transformations, the curves of periodic points of a general transformation cross the level curves of its integrals. This leads to the divergence of the normal form for a general…

Complex Variables · Mathematics 2009-09-25 Xianghong Gong

We prove that a class of weakly partially hyperbolic endomorphisms on $\mathbb{T}^2$ are dynamically coherent and leaf conjugate to linear toral endomorphisms. Moreover, we give an example of a partially hyperbolic endomorphism on…

Dynamical Systems · Mathematics 2020-12-02 Layne Hall , Andy Hammerlindl

In this paper, we give a precise meaning to the following fact, and we prove it: $C^1$-open and densely, all the non-hyperbolic ergodic measures generated by a robust cycle are approximated by periodic measures. We apply our technique to…

Dynamical Systems · Mathematics 2024-05-22 Christian Bonatti , Jinhua Zhang

Using systematically isothermal coordinates we show that there exist three different maximal extensions of the original Einstein-Rosen bridge. One of them, the hyperbolic Einstein-Rosen bridge, has two-dimensional sections diffeomorphic to…

General Relativity and Quantum Cosmology · Physics 2019-09-13 Pau Beltrán-Palau , Miguel Portilla

We study deformations of complex hyperbolic surfaces which furnish the simplest examples of: (i) negatively curved K\"ahler manifolds and (ii) negatively curved Riemannian manifolds not having {\it constant} curvature. Although such complex…

Differential Geometry · Mathematics 2016-09-06 Boris Apanasov

In this note we give a complete description of all the hyperplane section of the projective bundle associated to the tangent bundle of $\mathbb{P}^2$ under its natural embedding in $\mathbb{P}^7.$ As an application one obtains a description…

Algebraic Geometry · Mathematics 2021-03-23 A. El Mazouni , D. S. Nagaraj

This article is dedicated to the study of diagonal hyperbolic systems in one space dimension, with cumulative distribution functions, or more generally nonconstant monotonic bounded functions, as initial data. Under a uniform strict…

Analysis of PDEs · Mathematics 2015-07-07 Benjamin Jourdain , Julien Reygner
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