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arXiv 1005.4148math.GTmath.DS
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超椭圆分支中平移曲面上的伪Anosov同胚具有大熵

Pseudo-Anosov homeomorphisms on translation surfaces in hyperelliptic components have large entropy

Corentin Boissy, Erwan Lanneau

摘要:

我们证明了平移曲面上的任何伪Anosov同胚的伸缩属于超椭圆分量是从下有界的平方{2}。这与Penner的渐近性相反。彭纳证明了对数的最小膨胀的任何伪Anosov同胚表面的属g趋于零率1/g(g走向无穷大)。我们还表明,我们的一致下界sqrt{2}是尖锐的。更确切地说,超椭圆分量中亏格g>1的平移曲面上的伪Anosov的最小伸缩属于区间[sqrt{2},sqrt{2}+2^1-g}[。证明使用Rauzy-Veech归纳法。

英文摘要:

We prove that the dilatation of any pseudo-Anosov homeomorphism on a translation surface that belong to a hyperelliptic component is bounded from below uniformly by sqrt{2}. This is in contrast to Penner's asymptotic. Penner proved that the logarithm of the least dilatation of any pseudo-Anosov homeomorphism on a surface of genus g tends to zero at rate 1/g (as g goes to infinity). We also show that our uniform lower bound sqrt{2} is sharp. More precisely the least dilatation of a pseudo-Anosov on a genus g>1 translation surface in a hyperelliptic component belongs to the interval ]sqrt{2},sqrt{2}+2^{1-g}[. The proof uses the Rauzy-Veech induction.

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