We study the duality between theories of a fundamental scalar or fermion coupled to $U(N)$ Chern-Simons gauge theory at the level of the three-sphere partition function, or equivalently entanglement entropy across a circle. The duality relation between the sphere free energies of the large $N$ bosonic and fermionic conformal theories is sensitive to certain shifts in the Chern-Simons level already at order $N$. We first study a similar duality in a ${\cal N}=2$ supersymmetric Chern-Simons matter theory, where it can be checked exactly using localization. At large $N$, the free energies of supersymmetric and non-supersymmetric theories are related in a simple way, and we use this fact to obtain an explicit solution for the scalar and fermion free energies which obey the duality map and have the expected weak and strong coupling behaviors. We also suggest that a worldline representation of the free energy allows to relate its calculation to a sum of Wilson loops in pure Chern-Simons theory. In the supersymmetric case, we find that this approach precisely reproduces the localization prediction. In the non-supersymmetric case, we observe that a result consistent with the boson/fermion duality can be obtained using a certain framing prescription, which remains to be understood. We also briefly discuss the case of massive theories, and compare the small mass expansion of the free energy to previously known results for the correlation functions of bilinear operators in flat space.
Kapustin and Witten showed that a twisted version of N=4 gauge theory in four dimensions compactifies to a two-dimensional sigma-model whose target space is the Hitchin moduli space. In this talk, I consider the reduction of the gauge theory on a four dimensional orientable spacetime manifold which is not a global product of two surfaces but contains embedded non-orientable surfaces. The low energy theory is a sigma-model on a two dimensional worldsheet whose boundary components end on branes constructed from the Hitchin moduli space associated to a non-orientable surface. I will also compare …
We introduce a periodic form of the iterated algebraic K-theory of ku, the (connective) complex K-theory spectrum, as well as a natural twisting of this cohomology theory by higher gerbes. Furthermore, we prove a form of topological T-duality for sphere bundles oriented with respect to this theory.
We introduce the quasi-topological electromagnetism which is defined to be the squared norm of the topological 4-form $F\wedge F$. A salient property is that its energy-momentum tensor is of the isotropic perfect fluid with the pressure being precisely the opposite to its energy density. It can thus provide a model for dark energy. We study its application in both black hole physics and cosmology. The quasi-topological term has no effect on the purely electric or magnetic Reissner-Nordström black holes, the dyonic solution is however completely modified. We find that the dyonic black holes can…
Duality Symmetries for N=2 Supersymmetric QCD with Vanishing beta-Functions
我们构造了N=2超对称QCD的对偶群，规范群为SU（2n+1），N_f= 4 n +2超多重态为基本表象。这些组由满足关系$(STS^{-1}T)^{2n+1}=1$的两个元素$S$和$T$生成。因此，这些组不是$SL(2,Z)$的亚组。我们还构造了自守函数，将$T$和$STS$生成的群的基本区域映射到黎曼球面。这些自守函数忠实地代表了塞伯格-威滕曲线的对偶对称性。
We consider T[SU(N)] and its mirror, and we argue that there are two more dual frames, which are obtained by adding flipping fields for the moment maps on the Higgs and Coulomb branch. Turning on a monopole deformation in T[SU(N)], and following its effect on each dual frame, we obtain four new daughter theories dual to each other. We are then able to construct pairs of 3d spectral dual theories by performing simple operations on the four dual frames of T[SU(N)]. Engineering these 3d spectral pairs as codimension-two defect theories coupled to a trivial 5d theory, via Higgsing, we show that ou…
We construct gauge theories with a vector-multiplet and hypermultiplets of $(1,0)$ supersymmetry on the six-sphere. The gauge coupling on the sphere depends on the polar angle. This has a natural explanation in terms of the tensor branch of $(1,0)$ theories on the six-sphere. For the vector-multiplet we give an off-shell formulation for all supersymmetries. For hypermultiplets we give an off-shell formulation for one supersymmetry. We show that the path integral for the vector-multiplet localizes to solutions of the Hermitian-Yang-Mills equation, which is a generalization of the (anti-)self du…
Equations of Motion Solved by the Cremmer-Scherk Configuration on Even-Dimensional Spheres
量子电动力学的低能有效理论的运动方程包含无限多的相互作用项，这使得它们难以求解。自对偶性质为研究这类方程的解提供了方便。本文考虑偶数维球面上非阿贝尔规范场系统的运动方程。证明了满足某些广义自对偶方程的Cremmer-Scherk组态成为由2 m +1个量的C^1类任意函数所给出的系统类的经典解。例如，由多迹项组成的拉格朗日量就包括在这一类中。这一结果可能会产生几个新的和有趣的研究方向，包括分类的行动相对于Cremmer-Scherk配置的稳定性条件。
