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arXiv 0811.0165math.DGmath.NT
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迁移原理与局部对称空间

Transference principles and locally symmetric spaces

Cornelia Drutu

摘要:

我们解释了如何从丢番图逼近的迁移原理可以解释在几何的局部对称空间$T_n=SO(n) \backslash SL(n,R) /SL(n,Z)$与$n>1$,以及如何,通过这个字典,他们成为透明的几何备注,可以很容易地证明。事实上,一个有限族的线性形式是自然地确定为一个局部测地线射线在一个空间$T_n$和这个家庭的方式是近似反映的高度,在该射线上升的尖状端。传递定理中出现的两种近似之间的唯一区别是高度是相对于$W$中的不同射线测量的,$W$是$T_n$中的Weyl室。因此,传递定理等价于$W$中两条射线的Busemann函数之间的关系。这种关系在$W$上很容易建立,因为限制到它,两个Busemann函数变成两个线性型。由于$T_n$与$W$之间的Hausdorff距离有限,因此在整个$T_n$上,直到有界扰动,也满足相同的关系。

英文摘要:

We explain how the Transference Principles from Diophantine approximation can be interpreted in terms of geometry of the locally symmetric spaces $T_n=SO(n) \backslash SL(n,R) /SL(n,Z)$ with $n>1$, and how, via this dictionary, they become transparent geometric remarks and can be easily proved. Indeed, a finite family of linear forms is naturally identified to a locally geodesic ray in a space $T_n$ and the way this family is approximated is reflected by the heights at which the ray rises in the cuspidal end. The only difference between the two types of approximation appearing in a Transference Theorem is that the height is measured with respect to different rays in $W$, a Weyl chamber in $T_n$. Thus the Transference Theorem is equivalent to a relation between the Busemann functions of two rays in $W$. This relation is easy to establish on $W$, because restricted to it the two Busemann functions become two linear forms. Since $T_n$ is at finite Hausdorff distance from $W$, the same relation is satisfied up to a bounded perturbation on the whole of $T_n$.

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