SciPost Phys. 12, 140 (2022) ·
published 26 April 2022

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We consider supersymmetric surface defects in compactifications of the $6d$
minimal $(D_{N+3},D_{N+3})$ conformal matter theories on a punctured Riemann
surface. For the case of $N=1$ such defects are introduced into the
supersymmetric index computations by an action of the $BC_1\,(\sim A_1\sim
C_1)$ van Diejen model. We (re)derive this fact using three different field
theoretic descriptions of the four dimensional models. The three field
theoretic descriptions are naturally associated with algebras $A_{N=1}$,
$C_{N=1}$, and $(A_1)^{N=1}$. The indices of these $4d$ theories give rise to
three different Kernel functions for the $BC_1$ van Diejen model. We then
consider the generalizations with $N>1$. The operators introducing defects into
the index computations are certain $A_{N}$, $C_N$, and $(A_1)^{N}$
generalizations of the van Diejen model. The three different generalizations
are directly related to three different effective gauge theory descriptions one
can obtain by compactifying the minimal $(D_{N+3},D_{N+3})$ conformal matter
theories on a circle to five dimensions. We explicitly compute the operators
for the $A_N$ case, and derive various properties these operators have to
satisfy as a consequence of $4d$ dualities following from the geometric setup.
In some cases we are able to verify these properties which in turn serve as
checks of said dualities. As a byproduct of our constructions we also discuss
a simple Lagrangian description of a theory corresponding to compactification
on a sphere with three maximal punctures of the minimal $(D_5,D_5)$ conformal
matter and as consequence give explicit Lagrangian constructions of
compactifications of this 6d SCFT on arbitrary Riemann surfaces.
Chiung Hwang, Shlomo S. Razamat, Evyatar Sabag, Matteo Sacchi
SciPost Phys. 11, 044 (2021) ·
published 30 August 2021

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We consider compactifications of rank $Q$ Estring theory on a genus zero surface with no punctures but with flux for various subgroups of the $\mathrm{E}_8\times \mathrm{SU}(2)$ global symmetry group of the six dimensional theory. We first construct a simple WessZumino model in four dimensions corresponding to the compactification on a sphere with one puncture and a particular value of flux, the cap model. Using this theory and theories corresponding to two punctured spheres with flux, one can obtain a large number of models corresponding to spheres with a variety of fluxes. These models exhibit interesting IR enhancements of global symmetry as well as duality properties. As an example we will show that constructing sphere models associated to specific fluxes related by an action of the Weyl group of $\mathrm{E}_8$ leads to the Sconfinement duality of the $\mathrm{USp}(2Q)$ gauge theory with six fundamentals and a traceless antisymmetric field. Finally, we show that the theories we discuss possess an $\mathrm{SU}(2)_{\text{ISO}}$ symmetry in four dimensions that can be naturally identified with the isometry of the twosphere. We give evidence in favor of this identification by computing the `t Hooft anomalies of the $\mathrm{SU}(2)_{\text{ISO}}$ in 4d and comparing them with the predicted anomalies from 6d.
Sara Pasquetti, Shlomo S. Razamat, Matteo Sacchi, Gabi Zafrir
SciPost Phys. 8, 014 (2020) ·
published 29 January 2020

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We discuss compactifications of rank $Q$ Estring theory on a torus with
fluxes for abelian subgroups of the $E_8$ global symmetry of the $6d$ SCFT. We
argue that the theories corresponding to such tori are built from a simple
model we denote as $E[USp(2Q)]$. This model has a variety of non trivial
properties. In particular the global symmetry is $USp(2Q)\times USp(2Q)\times
U(1)^2$ with one of the two $USp(2Q)$ symmetries emerging in the IR as an
enhancement of an $SU(2)^Q$ symmetry of the UV Lagrangian. The $E[USp(2Q)]$
model after dimensional reduction to $3d$ and a subsequent Coulomb branch flow
is closely related to the familiar $3d$ $T[SU(Q)]$ theory, the model residing
on an Sduality domain wall of $4d$ $\mathcal{N}=4$ $SU(Q)$ SYM. Gluing the
$E[USp(2Q)]$ models by gauging the $USp(2Q)$ symmetries with proper admixtures
of chiral superfields gives rise to systematic constructions of many examples
of $4d$ theories with emergent IR symmetries. We support our claims by various
checks involving computations of anomalies and supersymmetric partition
functions. Many of the needed identities satisfied by the supersymmetric
indices follow directly from recent mathematical results obtained by E. Rains.
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