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In 1999 Chas and Sullivan discovered that the homology (X) of the space of

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In 1999 Chas and Sullivan discovered that the homology (X) of the space of - PowerPoint PPT Presentation


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Name: Dmitry Vaintrob High School: South Eugene High School Mentor: Dr. Pavel Etingof Project Title: The String Topology BV Algebra, Hochschild Cohomology and the Goldman Bracket on Surfaces. In 1999 Chas and Sullivan discovered that the homology (X) of the space of

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Name: Dmitry Vaintrob

  • High School: South Eugene High School
  • Mentor: Dr. Pavel Etingof
  • Project Title: The String Topology BV Algebra, Hochschild Cohomology and the Goldman Bracket on Surfaces
  • In 1999 Chas and Sullivan discovered that the homology (X) of the space of
  • free loops a closed oriented smooth manifold X has a rich algebraic structure called
  • string topology. They proved that (X) is naturally a Batalin-Vilkovisky (BV) algebra. There are several conjectures connecting the string topology BV-algebra with algebraic structures on the Hochschild cohomology of algebras related to the manifold X, but none of them has been verified for manifolds of dimension n > 1.
  • In this work we study string topology in the case when X is aspherical (i.e. its
  • homotopy groups (X) vanish fori> 1). In this case the Hochschild cohomology
  • Gerstenhaber algebra H H*(A) of the group algebra A of the fundamental group of X has a BV structure. Our main result is a theorem establishing a natural isomorphism between the Hochschild cohomology BV algebra H H*(A) and the string topology BV-algebra (X).
  • In particular, for a closed oriented surface X of hyperbolic type we obtain a complete description of the BV algebra operations on (X) and H H*(A) in terms of the Goldman bracket of loops on X. The only manifolds for which the BV algebra structure on (X) was known before were spheres.
  • Our proof is based on a combination of topological and algebraic constructions allowing us to compute and compare multiplications and BV operators on both (X) and H H*(A).
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