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Yin, Xi

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Yin, Xi
Author's Publications: search.filters.isAuthorOfPublication.563d8477-6691-4e29-96fc-237df1f80951

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Now showing 1 - 5 of 5
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    Higher Spins in AdS and Twistorial Holography
    (Springer Verlag, 2011) Giombi, Simone; Yin, Xi
    In this paper we simplify and extend previous work on three-point functions in Vasiliev's higher spin gauge theory in \(AdS_4\). We work in a gauge in which the space-time dependence of Vasiliev's master fields is gauged away completely, leaving only the internal twistor-like variables. The correlation functions of boundary operators can be easily computed in this gauge. We find complete agreement of the tree level three point functions of higher spin currents in Vasiliev's theory with the conjectured dual free O(N) vector theory.
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    On Non-Handlebody Instantons in 3D Gravity
    (Springer Verlag, 2008) Yin, Xi
    In 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.
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    One-loop Partition Functions of 3D Gravity
    (Springer Verlag, 2008) Giombi, Simone; Maloney, Alexander; Yin, Xi
    We 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.
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    Spin Chains in \(\mathcal{N}\)=6 Superconformal Chern-Simons-Matter Theory
    (Springer Verlag, 2009) Gaiotto, Davide; Giombi, Simone; Yin, Xi
    In 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.
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    Quantum Phase Transitions Beyond the Landau-Ginzburg Paradigm and Supersymmetry
    (Elsevier, 2010) Sachdev, Subir; Yin, Xi
    We make connections between studies in the condensed matter literature on quantum phase transitions in square lattice antiferromagnets, and results in the particle theory literature on abelian supersymmetric gauge theories in 2+1 dimensions. In particular, we point out that supersymmetric U(1) gauge theories (with particle content similar, but not identical, to those of theories of doped antiferromagnets) provide rigorous examples of quantum phase transitions which do not obey the Landau-Ginzburg-Wilson paradigm (often referred to as transitions realizing "deconfined criticality"). We also make connections between supersymmetric mirror symmetries and condensed matter particle-vortex dualities.