Dipartimento di Matematica ''F. Casorati''

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On moduli spaces of spherical surfaces with conical points

Gabriele Mondello (Roma Sapienza)

Sala Ruinioni al piano C - Thursday, March 28, 2019 h.17:00

Abstract. Metrics of positive curvature (with conical singularities) on surfaces behave quite differently than flat or hyperbolic ones.
In particular, existence and uniqueness of spherical (i.e. K=1) metrics in a given conformal class is not granted.
The aim of the talk is to address a number of features of the moduli spaces of spherical metrics on compact oriented surfaces with conical singularities of prescribed angles.
Among the global properties, we discuss non-emptiness and we show that such moduli spaces can have an arbitrarily large number of connected components.
Furthermore, we show that no spherical metric in a given conformal class exists if one angle is too small. Such result relies on an explicit systole inequality which relates metric invariants (systole) and conformal invariants (extremal systole) of spherical surfaces, and that can be of independent interest.

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Dipartimento di Matematica ''F. Casorati''

Università degli Studi di Pavia - Via Ferrata, 5 - 27100 Pavia
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