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Hyperbolic Volume, Mod 2 Homology, and K-freeness by Guzman, Rosemary K.; Shalen, Peter B. is a scholarly article available to read on EtoBox.

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We show that if $M$ is any closed, orientable hyperbolic $3$-manifold with ${\rm vol}\ M\le3.69$, we have ${\rm dim}\ H_1(M;{\bf F}_2)\le7$. This may be regarded as a qualitative improvement of a result due to Culler and Shalen, because the constant $3.69$ is greater than the ordinal corresponding to $\omega^2$ in the well-ordered set of finite volumes of hyperbolic $3$-manifolds. We also show that if ${\rm vol}\ M\le 3.77$, we have ${\rm dim}\ H_1(M;{\bf F}_2)\le10$. These results are applications of a new method for obtaining lower bounds for the volume of a closed, orientable hyperbolic $3$-manifold such that $\pi_1(M)$ is $k$-free for a given $k\ge4$. Among other applications we show that if $\pi_1(M)$ is $4$-free we have ${\rm vol}\ M>3.57$ (improving the lower bound of $3.44$ given by Culler and Shalen), and that if $\pi_1(M)$ is $5$-free we have ${\rm vol}\ M>3.77$.

Author

Guzman, Rosemary K.; Shalen, Peter B.

Published

2020

Language

EN