## Events - Daily

**December 11, 2012**>>

Tuesday,
December 11 |
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High Energy Theory Informal Seminar - IAS- Joe Polchinski, KITP, University of CA, Santa Barbara-Scale and Conformal Invariance in Quantum Field" Bloomberg Lecture Hall - Institute for Advanced Study · 1:30 p.m.– 2:30 p.m. |

Math Phys Seminar: Jean-Pierre Eckman (University of Geneva) 'Atoms, Nuclei, and 3d Triangulations' Based on the work of Durhuus-Jonsson and Benedetti-Ziegler, we revisit the question of the number of triangulations of the 3-ball. We introduce a notion of nucleus (a triangulation of the 3-ball without internal nodes, and with each internal face having at most 1 external edge). We show that every triangulation can be built from trees of nuclei. This leads to a new reformulation of Gromov's question: We show that if the number of rooted nuclei with N tetrahedra is exponentially bounded in N, then the number of rooted triangulations with N tetrahedra is also exponentially bounded. This is joint work with Pierre Collet and Maher Younan. Jadwin A06 · 3:30 p.m.– 5:00 p.m. |