Person: Yin, Xi
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Publication On Non-Handlebody Instantons in 3D Gravity
(Springer Verlag, 2008) Yin, XiIn this note we describe the contribution from non-handlebody geometries to the partition function of three-dimensional pure gravity with negative cosmological constant on a Riemann surface of genus greater than one, extending previous considerations for handlebodies.
Publication One-loop Partition Functions of 3D Gravity
(Springer Verlag, 2008) Giombi, Simone; Maloney, Alexander; Yin, XiWe consider the one-loop partition function of free quantum field theory in locally Anti-de Sitter space-times. In three dimensions, the one loop determinants for scalar, gauge and graviton excitations are computed explicitly using heat kernel techniques. We obtain precisely the result anticipated by Brown and Henneaux: the partition function includes a sum over "boundary excitations" of AdS3, which are the Virasoro descendants of empty Anti-de Sitter space. This result also allows us to compute the one-loop corrections to the Euclidean action of the BTZ black hole as well its higher genus generalizations.
Publication Spin Chains in (\mathcal{N})=6 Superconformal Chern-Simons-Matter Theory
(Springer Verlag, 2009) Gaiotto, Davide; Giombi, Simone; Yin, XiIn this note we study spin chain operators in the (\mathcal{N})=6 Chern-Simons-matter theory recently proposed by Aharony, Bergman, Jafferis and Maldacena to be dual to type IIA string theory in (AdS_4) x (\mathbb{CP}^3). We study the two-loop dilatation operator in the gauge theory, and compare to the Penrose limit on the string theory side.