Benjamin Collas, Postdoctoral Research Associate
I am a postdoctoral research associate in the Topology team of Pr. Dr. Michael Weiss.
My research interests focus on Arithmetic Geometry in general and Grothendieck-Teichmüller in particular. My work deals with moduli spaces of marked curves and their stack inertia in relation with mapping class group and braids group properties, as well as with the Hurwitz stack of G-cover.
At the level of profinite torsion an important role is played by the Serre cohomological property of ,,bonté'' for residual finite group.
I am also interested in Galois action on the fundamental group of hyperplans arrangements (i.e. profinite generalized braid groups associated) in respect with a Dynkin-Lego compatibility.
- Action of the Grothendieck-Teichmüller group on torsion elements of full Teichmüller modular groups in genus zero, Journal de Théorie des Nombres de Bordeaux, vol.24, Iss.3, 2012.
- Action of a Grothendieck-Teichmüller group on torsion elements of full Teichmüller modular groups in genus one, International Journal of Number Theory, vol.8, Iss.3, 2012.
- Composantes irréductibles de lieux spéciaux d'espaces de modules de courbes, action galoisienne en genre quelconque, Annales de l'Institut Fourier, 2014. With S. Maugeais.
SeminarsI am organizing the Leray Seminar of M. Weiss Topology Team as well as the Operads in Muenster subseminar, each of them being 4 hours long (with a break). If you are interested in giving a talk, please contact me (see calendars below or the wochenplan).
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