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Abstract: The double ramification cycle in the moduli space of smooth algebraic curves with marked points is the locus of curves whose marked points form the support of a principal divisor. A natural Chow class representing the compactification of such locus is the push-forward of the virtual fundamental class of the space of rubber maps to P1 relative to 0 and infinity. In a series of papers with A. Buryak (and, in part, with B. Dubrovin and J. Guéré), we have studied the intersection theory of such cycle with other tautological classes. In particular, inspired by ideas from Eliashberg, Givental and Hofer's Symplectic Field Theory, we have developed a construction using the DR cycle to associate to any cohomological field theory on the moduli space of stable curves an integrable system (of Hamiltonian PDEs) and its quantization, called the DR hierarchy. This turns out to have a deep relation, via a more classical construction of Dubrovin and Zhang, with Gromov-Witten theory, mirror symmetry and the structure of the tautological ring. I will try to introduce in a simple way the main ideas and features of this construction and showcase some of its applications.
Abstract: Gauged linear sigma models (GLSMs) can be used to analyse Calabi-Yaus and their moduli spaces. Recent results in supersymmetric localisation have made it possible to compute exact, i.e. fully quantum corrected, quantities that are relevant in string compactifications directly in the GLSM. After a review of the general framework, I will present some recent applications with focus on the sphere and hemisphere partition function of the GLSM.
Abstract: Closing lemmas and connecting lemmas are of great importance in smooth dynamics. I will explain what they are. Then I will describe new joint work with Leandro Arosio. We have proved new closing lemmas and connecting lemmas in holomorphic dynamics.
Abstract: We consider the alpha invariant of any smooth complex projective spin complete intersection of dimension 1 mod 4. We prove that the alpha invariant depends only on the total degree and Pontryagin classes. This is in agreement with a long-standing conjecture which states that two complete intersections (in any dimension greater than 2) with the same total degrees, Pontryagin and Euler classes are diffeomorphic.