I'm currently working on the following projects:

Riemannian metrics on the moduli space of GHMC anti-de Sitter structures

We first extend the construction of the pressure metric to the deformation space of globally hyperbolic maximal Cauchy-compact anti-de Sitter structures. We show that, in contrast with the case of the Hitchin components, the pressure metric is degenerate and we characterize its degenerate locus. We then introduce a nowhere degenerate Riemannian metric adapting the work of Qiongling Li to this moduli space. We prove that the Fuchsian locus is totally geodesic copy of Teichmüller space endowed with a multiple of the Weil-Petersson metric.

Para-complex geometry of the moduli space of GHMC anti-de Sitter structures
Cyclic planar minimal surfaces with polynomial growth in SL(n,R)/SO(n)

We study the asymptotic geometry of the planar minimal surfaces with polynomial growth in the symmetric space SL(n,R)/SO(n) belonging to the Hitchin section. This generalizes our previous result concerning Sp(4,R)/U(2).


Here is a list with my papers:

Limits of Blaschke metrics   joint with Charles Ouyang

We find a compactification of the SL(3,R)-Hitchin component by studying the degeneration of the Blaschke metrics on the associated equivariant affine spheres. In the process, we establish the closure in the space of projectivised geodesic currents of the space of flat metrics induced by holomorphic cubic differentials on a Riemann surface.


Fenchel-Nielsen coordinates on the augmented moduli space of anti-de Sitter structures

We combine our recent work on regular globally hyperbolic maximal anti-de Sitter structures with the classical theory of globally hyperbolic maximal Cauchy-compact anti-de Sitter manifolds in order to define an augmented moduli space of such structures. Moreover, we introduce a coordinate system in this space that resembles the complex Fenchel-Nielsen coordinates on hyperbolic quasi-Fuchsian manifolds.


Planar minimal surfaces with polynomial growth in the Sp(4,R)-symmetric space   joint with Mike Wolf

We characterize conformally planar minimal surfaces with polynomial growth in the Sp(4,R)-symmetric space in terms of their boundary at infinity. Moreover, we relate these surfaces to convex embeddings into the Grassmannian of symplectic planes of R4 and maximal surfaces with light-like polygonal boundary in H2,2.

  • In preparation

Wild globally hyperbolic maximal anti-de Sitter structures

Let S be a connected, oriented surface with punctures and negative Euler characteristic. We define a family of globally hyperbolic maximal anti-de Sitter structures on S×I parameterised by the bundle over the Teichmüller space of S of meromorphic quadratic differentials on S with poles of order at least 3 at the punctures.


Degeneration of globally hyperbolic maximal anti-de Sitter structures along pinching sequences

Let S be a closed oriented surface of genus at least 2. Using the parameterisation of the deformation space of globally hyperbolic maximal anti-de Sitter structures on S×I by the cotangent bundle over the Teichmüller space of S , we study the behaviour of these geometric structures along pinching sequences. We show, in particular, that regular globally hyperbolic anti-de Sitter structures naturally appear as limiting points.


Regular globally hyperbolic maximal anti-de Sitter structures

Let S be a connected, oriented surface with punctures and negative Euler characteristic. We introduce regular globally hyperbolic anti-de Sitter structures on S×I and provide two parameterisations of their deformation space: as an enhanced product of two copies of the Fricke space of S and as the bundle over Teichmüller space of meromorphic quadratic differentials with poles of order at most 2 at the punctures.


Polynomial quadratic differentials on the complex plane and light-like polygons in the Einstein Universe

We construct geometrically a homeomorphism between the moduli space of polynomial quadratic differentials on the complex plane and light-like polygons in the 2-dimensional Einstein Universe. As an application, we find a class of minimal Lagrangian maps between ideal polygons in the hyperbolic plane.


Entropy degeneration of globally hyperbolic maximal compact anti-de Sitter structures

Using the parameterisation of the deformation space of GHMC anti-de Sitter structures on S×I by the cotangent bundle of the Teichmüller space of S, we study how some geometric quantities, such as the Lorentzian Hausdorff dimension of the limit set, the width of the convex core and the Hölder exponent, degenerate along rays of quadratic differentials.


Constant mean curvature foliation of globally hyperbolic (2+1)-spacetimes with particles   joint with Qiyu Chen

Let M be a globally hyperbolic 3-dimensional spacetime locally modelled on Minkowski, Anti-de Sitter or de Sitter space. It is well known that M admits a unique foliation by constant mean curvature surfaces. In this paper we extend this result to singular spacetimes with particles (i.e. conical singularities of angle less than π along time-like geodesics).


On the volume of Anti-de Sitter maximal globally hyperbolic three-manifolds   joint with Francesco Bonsante and Andrea Seppi

We study the volume of maximal globally hyperbolic Anti-de Sitter manifolds containing a closed orientable Cauchy surface S , in relation to some geometric invariants depending only on the two points h and h' in Teichmüller space of S provided by Mess' parameterization. The main result of the paper is that the volume coarsely behaves like the minima of the L^1-energy of maps from (S,h) to (S,h'). A corollary of our result shows that the volume of maximal globally hyperbolic Anti-de Sitter manifolds is bounded from above by the exponential of (any of the two) Thurston's Lipschitz asymmetric distances, up to some explicit constants. Although there is no such bound from below, we provide examples in which this behavior is actually realized. We prove instead that the volume is bounded from below by the exponential of the Weil-Petersson distance.


Constant mean curvature foliation of domains of dependence in Anti-de Sitter space

We prove that, given an acausal curve in the boundary at infinity of Anti-de Sitter space which is the graph of a quasi-symmetric homeomorphism, there exists a foliation of its domain of dependence by constant mean curvature surfaces with bounded second fundamental form. Moreover, these surfaces provide a family of quasi-conformal extensions of the quasi-symmetric homeomorphism we started with.


Prescribing metrics on the boundary of AdS 3-manifolds

We prove that given two metrics with curvature less than −1 on a closed, oriented surface of genus greater than 2, there exists an Anti-de-Sitter manifold with smooth, space-like, strictly convex boundary such that the induced metrics on the two connected components are equal to the two metrics we started with. Using the duality between convex space-like surfaces in Anti-de-Sitter space, we obtain an equivalent result about the prescription of the third fundamental form.