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arXiv 1503.03971math.DG
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有限体积负曲流形的渐近几何

Asymptotic geometry of negatively curved manifolds of finite volume

F. Dal'Bo, M. Peigné, J. C. Picaud, A. Sambusetti

摘要:

研究了单连通严格负曲率黎曼流形$X$的渐近行为,其中包含一个非均匀格$Γ$ .若商流形$\bar X= Γ\backslash X$是渐近$1/4$ -pinched的,则证明了$Γ$是发散的,$U\bar X$有有限Bowen-Margulis测度(它是遍历的,并且关于测地线流是完全保守的);此外,我们表明,在这种情况下,球$B(x,R)$在$X$中的体积增长渐近地等价于纯指数函数$c(x)e^{δR}$,其中$δ$是$\bar X$的测地线流的拓扑熵。\linebreak这将著名的Margulis定理推广到有限体积的负曲空间。相比之下,我们展示的例子晶格$Γ$在负弯曲空间$X$(不渐近$1/4$ -捏),根据临界指数的抛物子群和有限的鲍文-马古利斯措施,增长函数是指数,低指数,甚至高指数。

英文摘要:

We study the asymptotic behaviour of simply connected, Riemannian manifolds $X$ of strictly negative curvature admitting a non-uniform lattice $Γ$. If the quotient manifold $\bar X= Γ\backslash X$ is asymptotically $1/4$-pinched, we prove that $Γ$ is divergent and $U\bar X$ has finite Bowen-Margulis measure (which is then ergodic and totally conservative with respect to the geodesic flow); moreover, we show that, in this case, the volume growth of balls $B(x,R)$ in $X$ is asymptotically equivalent to a purely exponential function $c(x)e^{δR}$, where $δ$ is the topological entropy of the geodesic flow of $\bar X$. \linebreak This generalizes Margulis' celebrated theorem to negatively curved spaces of finite volume. In contrast, we exhibit examples of lattices $Γ$ in negatively curved spaces $X$ (not asymptotically $1/4$-pinched) where, depending on the critical exponent of the parabolic subgroups and on the finiteness of the Bowen-Margulis measure, the growth function is exponential, lower-exponential or even upper-exponential.

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