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Search options questions only not deleted user 1345
10 votes
1 answer
375 views

Heegaard genus of covers of cusped hyperbolic 3-manifold

Is there a cusped (non-compact) orientable hyperbolic 3-manifold $M$ which has Heegaard genus $g$, and has a finite-sheeted cover with Heegaard genus $<g$? Moreover, if the cover is index $n$, then it …
Ian Agol's user avatar
  • 68.9k
21 votes
1 answer
726 views

Complexifications of hyperbolic manifolds

I'm wondering when a compact hyperbolic $n$-manifold ($n \geq 3$) can embed in a complex hyperbolic $n$-manifold as a real algebraic subvariety so that it is a component of the fixed point set of comp …
Ian Agol's user avatar
  • 68.9k
10 votes
0 answers
132 views

Space of thick ending laminations

Let $\Sigma$ be a compact closed connected oriented surface of genus $g>1$. Klarreich proved that the space of ending laminations $\mathcal{EL}(\Sigma)$ is the ideal boundary of the curve complex $C(\ …
Ian Agol's user avatar
  • 68.9k
7 votes
0 answers
120 views

Projections of closed geodesics under the modular function

In the answers to this question it was shown that for closed geodesics on $\mathbb{H}^2/\Gamma(2)$, the projection under the modular function $\lambda$ is an immersed topological component of a real a …
Ian Agol's user avatar
  • 68.9k