On the fundamental group of non-positively curved manifolds

1987 ◽  
Vol 276 (2) ◽  
pp. 269-278 ◽  
Author(s):  
Michael T. Anderson
Keyword(s):  
Fundamental Group ◽  
Curved Manifolds ◽  
Positively Curved

scholarly journals Flat strips, Bowen–Margulis measures, and mixing of the geodesic flow for rank one CAT(0) spaces

2015 ◽  
Vol 37 (3) ◽  
pp. 939-970 ◽  
Author(s):  
RUSSELL RICKS
Keyword(s):  
Geodesic Flow ◽  
Isometric Action ◽  
Structural Result ◽  
Curved Manifolds ◽  
Rank One ◽  
Unit Speed ◽  
Flat Strip ◽  
Geodesically Complete ◽  
Positively Curved ◽  
General Technical

Let$X$be a proper, geodesically complete CAT($0$) space under a proper, non-elementary, isometric action by a group$\unicode[STIX]{x1D6E4}$with a rank one element. We construct a generalized Bowen–Margulis measure on the space of unit-speed parametrized geodesics of$X$modulo the$\unicode[STIX]{x1D6E4}$-action. Although the construction of Bowen–Margulis measures for rank one non-positively curved manifolds and for CAT($-1$) spaces is well known, the construction for CAT($0$) spaces hinges on establishing a new structural result of independent interest: almost no geodesic, under the Bowen–Margulis measure, bounds a flat strip of any positive width. We also show that almost every point in$\unicode[STIX]{x2202}_{\infty }X$, under the Patterson–Sullivan measure, is isolated in the Tits metric. (For these results we assume the Bowen–Margulis measure is finite, as it is in the cocompact case.) Finally, we precisely characterize mixing when$X$has full limit set: a finite Bowen–Margulis measure is not mixing under the geodesic flow precisely when$X$is a tree with all edge lengths in$c\mathbb{Z}$for some$c>0$. This characterization is new, even in the setting of CAT($-1$) spaces. More general (technical) versions of these results are also stated in the paper.

scholarly journals Fibred coarse embedding into non-positively curved manifolds and higher index problem

2014 ◽  
Vol 267 (11) ◽  
pp. 4029-4065 ◽  
Author(s):  
Xiaoman Chen ◽  
Qin Wang ◽  
Zhijie Wang
Keyword(s):  
Curved Manifolds ◽  
Coarse Embedding ◽  
Index Problem ◽  
Positively Curved

scholarly journals Positively curved manifolds with symmetry

2006 ◽  
Vol 163 (2) ◽  
pp. 607-668 ◽  
Author(s):  
Burkhard Wilking
Keyword(s):  
Curved Manifolds ◽  
Positively Curved

Closed Geodesics on Positively Curved Manifolds

1982 ◽  
Vol 116 (2) ◽  
pp. 213 ◽  
Author(s):  
W. Ballmann ◽  
G. Thorbergsson ◽  
W. Ziller
Keyword(s):  
Closed Geodesics ◽  
Curved Manifolds ◽  
Positively Curved
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