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Search options questions only not deleted user 48526
1 vote
0 answers
260 views

Mirzakhani's work and surfaces with marked points on the boundary

Mirzakhani proved identities for the lengths of geodesic curves on Riemann surfaces of genus $g$ and with $n$ boundary components. She used these to provide an integration scheme over the correspondin …
giulio bullsaver's user avatar
4 votes
1 answer
425 views

Cluster algebras of type A and X

I will base my question on Fock and Goncharov's paper Dual Teichmüller and lamination spaces. Let $S$ be a surface with boundaries, marked points on such boundaries, punctures and boundaries without m …
giulio bullsaver's user avatar
3 votes
0 answers
104 views

Relating different parametrizations of moduli space of Riemann surfaces

I would like to understand, as explicitly as possible, how different coordinates on the moduli space of Riemann surfaces are related: On the one hand, there is a parametrization coming from hyperbolic …
giulio bullsaver's user avatar
2 votes
1 answer
151 views

Coordinates for Laminations: geometric versus shear

Let $S$ be an orientable surface with a triangulation T. A lamination $\ell$ is a simple closed curve on $S$, up to isotopy. We will assume that $\ell$ is drawn in such a way that it intersects the ed …
giulio bullsaver's user avatar
5 votes
1 answer
244 views

Explicit check of the invariance of the Weil-Petersson form

Using Fenchel-Nielsen coordinates, the Weil-Petersson metric can be written as $\omega_{WP} = \sum_{i} d\ell_i \wedge d \tau_i,$ where $i$ is an index labelling the curves of a pants decomposition of …
giulio bullsaver's user avatar
3 votes
1 answer
809 views

Moduli, Teichmüller spaces and mapping class group of a sphere with four punctures

In the complex analytic setting, it is easy to see that the moduli space of a sphere with four punctures is $\mathcal{M}=\mathbb{CP}^1 / { 0,1,\infty }$, since I can use a Moebius transformation to se …
giulio bullsaver's user avatar
2 votes
0 answers
154 views

Decorated Teichmuller space of a punctured disk and moduli space of the annuls

The decorated Teichmuller space of a disk with n punctures on the boundary and one in the interior is the the space of hyperbolic metrics on such a surface with an extra marking of an horocycle at eac …
giulio bullsaver's user avatar
11 votes
0 answers
273 views

Cluster algebra and Fenchel Nielsen coordinates

Certain cluster algebras arise from ideal triangulations of hyperbolic Riemann surfaces. The combinatorics behind their mutations can be understood in terms of "flips" in the triangulation, and the cl …
giulio bullsaver's user avatar
1 vote
0 answers
46 views

Real section of moduli space of Riemann surfaces

In (https://www.sciencedirect.com/science/article/pii/002240499390049Y) it is mentioned the real section of the moduli space of Riemann surfaces of genus 0. It can be intuitively defined as a subset w …
giulio bullsaver's user avatar
1 vote
0 answers
60 views

Annuli and pinched annuli vs circles and horocycles

Any annulus is biholomorphich to the Poincare' disk $D$ from wich a circle centered at the origin has been removed. If we want to parametrise annuli with punctures at one boundary, give the punctures …
giulio bullsaver's user avatar
1 vote
1 answer
358 views

Parabolic elements of the Poincare' disk automorphism group as limit of elliptic ones

The automorphism group of the Poincare' disk has elements called elliptic, which have a single fixed point in the interior of the disk, and can be represented as a rotation around this fixed point. I …
giulio bullsaver's user avatar
2 votes
1 answer
273 views

Build a Fuchsian group starting from punctures on a disk

Consider the moduli space of hyperbolic metrics on the disk with $n>3$ marked points on its boundary, $\mathcal{M}_{D,n}$. $\mathcal{M}_{D,n}$ can be parametrised in terms of cross ratios of the punc …
giulio bullsaver's user avatar
1 vote
0 answers
188 views

Cutting a circle from the hyperbolic plane

Let D be the Poincare' disk its natural hyperbolic metric and with at least 1 marked point on $\partial D$. Suppose I cut an hyperbolic circle of radius $r$ away from it, then I get a Riemann surface …
giulio bullsaver's user avatar
3 votes
1 answer
595 views

What is a half cusp in hyperbolic geometry?

I already asked this question on math.stackexchange, but it was suggested that I post it here as well. The paper Devadoss, Heath, and Vipismakul - Deformations of bordered Riemann surfaces and associ …
giulio bullsaver's user avatar