Questions tagged [negative-curvature]
The negative-curvature tag has no usage guidance.
13
questions
7
votes
1answer
144 views
Hyperbolic groups and spaces of negative curvature
Mikhail Gromov states that he "tried for about 10 years to prove that every hyperbolic group is realizable by a space of negative curvature" in his interview with Martin Raussen and Christian Skau (...
1
vote
1answer
120 views
Ergodicity of geodesic flow in negative curvatutre as a possible obstruction for consideration of limit cycles as closed geodesics(4)
Does the ergodicity of geodesic flow of compact surfaces with negative curvature stile hold for non compact case?
Is not the ergocity theorems of geodesic flow an obstruction to have a ...
8
votes
2answers
644 views
Riemannian metric on the sphere with at least one negative sectional curvature at every point
Does there exist a Riemannian metric on the $n$-sphere ($n > 2$) such that at each point some (but not every) sectional curvature is negative?
For $n=2$ it is easily seen that such a metric ...
0
votes
0answers
97 views
Bounding Riemannian Distance
If $(M,g)$ is a geodesically complete Riemannian manifold of negative sectional curvature bounded below by $K<0$ then is it true that for any $x,y,x_0\in M$
$$
d_H(
Log(x_0,x),Log(y,x_0)
)
\leq
d_M^...
1
vote
1answer
288 views
Riemannian Manifolds of Bounded Curvature
I am a complete newbie Riemannian Geometry with a particular application in mind so please excuse a lack of rigor in the question.
Suppose I have a manifold with sectional curvature everywhere ...
4
votes
1answer
119 views
Convex hull of a connected subset on a complete surface of non-positive curvature
Let $S$ be a simply connected surface, possibly with boundary components, with a smooth complete metric of non-positive curvature. Let $X\subset S$ be a closed connected subset. I would like to know ...
10
votes
0answers
247 views
Examples of quasi-negative but not negative holomorphic sectional curvature
Let $(X,\omega)$ be a compact Kähler manifold and call $\operatorname{HSC}_{\omega}(x,[v])$ the holomorphic sectional curvature of the Chern connection of $\omega$ at the point $x\in X$ in the ...
3
votes
1answer
511 views
On the Birkhoff ergodic theorem for geodesic flows
Let $S$ be a closed surface endowed with a Riemannian metric of negative curvature and let $US$ be the unit tangent bundle. Let $\mu$ be the Liouville measure on $US$.
Let $f: US\rightarrow\mathbb{R}$...
2
votes
0answers
78 views
Locus maximizing the holomorphic sectional curvature in a non-compact Hermitian symmetric space
Is there a quick way to prove the following statement, if possible without resorting to the classification of simple Lie groups?
Let $G$ be a simple Lie group of non-compact Hermitian type of rank $r$...
4
votes
1answer
359 views
Geometry of ends of a finite volume negatively curved manifold
Is there a survey of the geometry of manifolds with finite volume Riemannian metrics of negative sectional curvature? More specifically, I am interested in the geometry of cusp ends of such manifolds, ...
10
votes
1answer
436 views
Topological rigidity for negatively curved manifolds?
I was wondering if two compact oriented manifold carrying a Riemannian metric with negative sectional curvature, whose fundamental groups are isomorphic, are necessarily diffeomorphic (or homeomorphic)...
5
votes
2answers
431 views
Are ramified covering of negatively curved manifolds negatively curved?
Gromov and Thurston proved in "Pinching constants for hyperbolic manifolds" that any finite ramified covering of a compact hyperbolic manifold, along a codimension $2$ totally geodesic submanifold, ...
3
votes
1answer
201 views
Cusps as warped products
It is well-known that the ends of a finite-volume hyperbolic manifold are warped products $$(0,\infty)\times_f T$$
for some euclidean manifold $T$ and $f(t)=e^{-t}$.
Question: Is there a similar ...
