
Program  Home > Program 
Mon  Tue  Wed  Thu  Fri  
09:30  Piljin Yi  Chris Hull  Dario Martelli  Shiraz Minwalla 
09:30 Dongsu Bak
10:15 Coffee Break

10:30  Coffee Break  10:45 Minxin Huang  
11:00  Jaemo Park  David Berman  Maxim Zabzine  Nadav Drukker 
11:30 Seok Kim

11:45  RakKyeong Seong  JeongHyuck Park  Futoshi Yagi  Alessandro Tomasiello 
12:15 Workshop Ends

12:30  Lunch Break  
13:30  Discussion  
18:00  Dinner  
19:30  Kazuo hosomichi  Nori lizuka  Banquet  Matt Buican  
20:15  HeeCheol Kim  Costis Papageorgakis  Noppadol Mekareeya 
Mtheory Workshop Titles and Abstracts
Dongsu Bak (Seoul) "Physics of interface geometries"
The physics of Janus related system including Janus black branes and multiple interface black branes will be discussed. We obtain their free energy, correlated interface entropy and Casimir energy via geometric consideration.
David Berman (QMUL) "Solutions in double and exceptional field theory"
We examine wave, monopole and selfdual dyon solutions in double and exceptional field theories. We interpret these solutions in terms of usual supergravity and examine their properties.
Matthew Buican (Rutgers) "Conformal Manifolds of 4d N=2 SCFTs With NonInteger Dimension Chiral Primaries"
I will describe new Sdualities found by marginally gauging different global symmetry subgroups of two copies of a certain rankone ArgyresDouglas theory (along with a number of hypermultiplets) and studying the resulting conformal manifolds. Time permitting, I will then discuss some more exotic phenomena that occur on the conformal manifolds of certain more obscure theories.
Nadav Drukker (KCL) “3d mirror symmetry as a canonical transformation”
The partition function on S^3 of supersymmetric field theories can be reduced via localization to a matrix model. Equivalent theories under some duality, like mirror symmetry, should have the same partition function. This was indeed verified in many examples, usually by employing increasingly complex integral identities. In my talk I will point out that for certain theories which admit a free Fermigas description (as I will review), mirror symmetry is simply a canonical transformation on the phase space of the fermions.
Kazuo Hosomichi (NTU) "Surface operators in 4d N=2 gauge theories"
I will review some of the recent exact results for surface operators in 4D N=2 SUSY gauge theories.
Minxin Huang (CUST) "Topological strings on elliptic CalabiYau threefolds"
Chris Hull (Imperial) "The Geometry of Double Field Theory"
Norihiro Iizuka (Yukawa) "What does condensed matter physics tell us about general relativity?"
In this talk, we discuss and solve simple paradox where basic facts between condensed matter physics and general relativity(apparently) contradict through holography.
HeeCheol Kim (Perimeter) "The Superconformal Index of the (2,0) Theory with Defects"
In this talk, I will present how to compute the supersymmetric partition function of the sixdimensional (2,0) theory of type A_{N−1} on S1×S5 in the presence of both codimension two and codimension four defects. I will focus on a limit of the partition function depending on a single parameter. From the allowed supersymmetric configurations of defects the results show a precise match with the characters of irreducible modules of WN algebras and affine Lie algebras of type A_{N−1}.
Seok Kim (SNU) “Selfdual strings of 6d SCFTs”
I will discuss the 2d gauge theory descriptions of the selfdual strings of the 6d SCFTs. The case of Estrings will be discussed in detail, which are the selfdual strings of the 6d CFT for the M5M9 system. In particular, I will explain that the gauge theory allows us to exactly compute the elliptic genera of the Estrings.
Dario Martelli (KCL) “Exact results in supersymmetric field theories and holography”
I will overview some exact results in supersymmetric field theories, focussing on the localization technique in four dimensional gauge theories. After reviewing supersymmetric field theories on curved manifolds and localization, I will discuss applications including supersymmetric indices and the supersymmetric Casimir energy. Time permitting, I will conclude discussing the holographic counterpart of these results and some open questions.
Noppadol Mekareeya (CERN) "Coulomb branch and the moduli space of instantons"
I will explain how to compute the Hilbert series that counts chiral operators parametrising the Coulomb branch of the moduli space of 3d N=4 supersymmetric field theories. The formula has applications to physics, such as to the study of infrared dualities in three dimensions and of backgrounds with eight supercharges, as well as to mathematics, where it provides a new way to characterise hyperKahler cones as algebraic varieties. I will then show how the Coulomb branch of certain d=3 N=4 generalised quiver gauge theories can be used to compute the Hilbert series of the moduli space of k Ginstantons, for any simple Lie group G. The construction is alternative to the ADHM construction that is only available for classical groups G.
Shiraz Minwalla (TIFR) "Scattering in Large N matterChernSimons Theories"
Costis Papageorgakis (QMUL) "Instanton operators in 5D gauge theories"
We will discuss instanton operators in 5D YangMills gauge theories. These are defined as local operators which create a nonvanishing second Chern class on a foursphere surrounding their insertion point. As such they may be thought of as higherdimensional analogues of 3D monopole (or ‘t Hooft) operators. We argue that they play an important role in the enhancement of the Lorentz symmetry for maximally supersymmetric YangMills to SO(1, 5) at strong coupling.
Jaemo Park (Postech) "General instanton counting and 5d/6d SCFT"
Instanton partition functions of 5d N = 1 gauge theories are Witten indices for the ADHM gauged quantum mechanics with (0, 4) SUSY. We derive the integral contour prescriptions for these indices using the JeffreyKirwan method, for gauge theories with hypermultiplets in various representations. The results can be used to study various 4d/5d/6d QFTs. In this paper, we study 5d SCFTs which are at the UV fixed points of 5d SYM theories. In particular, we focus on the Sp(N) theories with Nf ≤ 7 fundamental and 1 antisymmetric hypermultiplets, living on the D4D8O8 systems. Their superconformal indices calculated from instantons all show E(Nf+1) symmetry enhancements. We also discuss some aspects of the 6d SCFTs living on the M5M9 system. It is crucial to understand the UV incompleteness of the 5d SYM, coming from small instantons in our problem. We explain in our examples how to fix them. As an aside, we derive the index for general gauged quantum mechanics with (0, 2) SUSY.
JeongHyuck Park (Seogang) "Stringy Differential Geometry and Double Field Theory"
The talk introduces a stringy differential geometry beyond Riemann which underlies Double Field Theory.
RakKyeong Seong (KIAS) “Massdeformed Brane Tilings and M2brane theories revisited”
Alessandro Tomasiello (Bicocca) “Sixdimensional superconformal theories in string theory”
Recently, AdS7 solutions in IIA supergravity have been classified. An infinite family of solutions has been identified; they are conjectured to be dual to a family of (1,0)supersymmetric CFT6’s obtained long ago by brane constructions. After reviewing those solutions, I will discuss more recent developments. First I will briefly describe some upcoming results about AdS4 and AdS5 vacua dual to compactifying the (1,0) theories on hyperbolic spaces and Riemann surfaces. This provides infinitely many 4d CFTs whose duals are analytically known. I will then discuss an extensions of the CFT6’s from an Ftheory construction, which as a byproduct suggests the existence of “fractional M5branes”.
Five dimensional N=1 supersymmetric SU(2) gauge theory with N_f flavor is believed to have a UV fixed point with enhanced global symmetry of E_{N_f+1}. It is known that the superconformal index on S^4 x S^1 is written in terms of the characters of E_{N_f+1}, supporting this global symmetry enhancement. In this talk, we discuss that the 5D Nekrasov partition function is also invariant under the Weyl symmetry of this E_{N_f+1} group if we properly redefine the Coulomb moduli parameter and expand in terms of it. Fiberbase duality of the CalabiYau geometry is useful to understand this invariance.
Piljin Yi (KIAS) "Witten Index and Quiver Invariants"
Maxim Zabzine (Uppsala) “Gauge theories with 16 supercharges on spheres”