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April 11, 2023 By GeometryAdmin

Ragini Singhal to talk in geometry seminar 02/05/2023

Ragini Singhal (Humboldt University, Berlin) will talk in the geometry seminar on 02/05/2023 at 2pm in the Salle des Profs (9th floor building NO, Campus de la Plaine). Ragini’s title is “Deformation theory of nearly G2 manifolds” and her abstract is below.

I this talk we will describe the deformation theory of nearly G2 manifolds. These are seven dimensional manifolds admitting real Killing spinors. We show that the infinitesimal deformations of nearly G2 structures are obstructed in general. Explicitly, we prove that the infinitesimal deformations of the homogeneous nearly G2 structure on the Aloff–Wallach space are all obstructed to second order. We also completely describe the cohomology of nearly G2 manifolds. This talk is based on a joint work with Dr Shubham Dwivedi (Humboldt University).

Filed Under: geometry seminar news

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Address

Département de mathématiques
Université libre de Bruxelles CP 218
Boulevard du Triomphe, Bruxelles 1050,
Belgium

Getting here

The department of mathematics is in building NO, on the Campus de la Plaine, of the Université libre de Bruxelles. The geometry group is on the 7th floor. This page has a map of the campus as well as information on how to reach it via public transport. See the STIB website for more information on public transport in Brussels.

Image credits

Polished ammonite fossil, by Kara Stenberg, Creative Commons licence CC BY-NC 2.0.

Model of 3D projection of a 120-cell, by Edmund Harriss.

The root system of the exceptional Lie algebra E8. By Jared Tarbell, Creative Commons Licence CC BY 2.0.

Getting here

The department of mathematics is in building NO, on the Campus de la Plaine, of the Université libre de Bruxelles. The geometry group is on the 7th floor. This map shows NO, as well as the metro station Delta and entrance 2, which is right by the stop for the number 71 and 72 buses. The number 95 also stops a short walk from the department. See the STIB website for more information on public transport in Brussels.

Image credits

Polished ammonite fossil, by Kara Stenberg, Creative Commons licence CC BY-NC 2.0.

Model of 3D projection of a 120-cell, by Edmund Harriss.

The root system of the exceptional Lie algebra E8. By Jared Tarbell, Creative Commons Licence CC BY 2.0.

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