CERNCKC TH Institute on Duality Symmetries in String and MTheories
from
Monday, August 3, 2015 (10:00 AM)
to
Friday, August 14, 2015 (6:00 PM)
Monday, August 3, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
Double Field Theory on Group Manifolds

Falk Haßler
(
MPI for Physics, Munich
)
Double Field Theory on Group Manifolds
Falk Haßler
(
MPI for Physics, Munich
)
10:30 AM  11:30 AM
Room: 43006  TH Conference Room
2:00 PM
Loops in exceptional field theory

Axel Kleinschmidt
(
MPI Potsdam
)
Loops in exceptional field theory
Axel Kleinschmidt
(
MPI Potsdam
)
2:00 PM  3:00 PM
Room: 43006  TH Conference Room
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room
Tuesday, August 4, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
How many coordinates does DFT have?

Georgios PAPADOPOULOS
(
Kings College London
)
How many coordinates does DFT have?
Georgios PAPADOPOULOS
(
Kings College London
)
10:30 AM  11:30 AM
Room: 43006  TH Conference Room
I shall describe the puzzles and challenges that rise in attempting to globally patch DFT. Then I shall propose a new class of spaces, the Cspaces, which contain locally the doubled spaces and resolve some of the puzzles. I shall also explain the relation of Cspaces to generalized geometry, and describe how the 3form flux is geometrised. Some topological aspects of the geometrisation of fluxes, in particular the relation to Whitehead towers, will be explored.
2:00 PM
Tduality and alphaprime corrections

Diego Marqués
(
IAFE Buenos Aires
)
Tduality and alphaprime corrections
Diego Marqués
(
IAFE Buenos Aires
)
2:00 PM  3:00 PM
Room: 43006  TH Conference Room
I will discuss recent results on Tduality symmetric descriptions of fourderivative terms in string effective actions.
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room
5:30 PM
reception
reception
5:30 PM  6:30 PM
Wednesday, August 5, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
On (4+6)dimensional SUSY vacua with nongeometric fluxes

David Andriot
(
MPI, AEI PotsdamGolm
)
On (4+6)dimensional SUSY vacua with nongeometric fluxes
David Andriot
(
MPI, AEI PotsdamGolm
)
10:30 AM  11:30 AM
Room: 43006  TH Conference Room
In the 10dimensional framework of betasupergravity, we characterize (4+6)dimensional vacua preserving supersymmetry. We rewrite Killing spinor equations with NSNS nongeometric fluxes using the language of SU(3)*SU(3) structures and Generalized Complex Geometry, in analogy to standard type II supergravities. The NSNS generalized differential operator D that appears exhibits interesting properties, among which being a Generalized Dirac operator. This formulation leads us to a general expression for the superpotential, and we successfully compare it to existing formulas in the literature.
2:00 PM
Double field theory and stringy geometry

Chris M Hull
(
Imperial College
)
Double field theory and stringy geometry
Chris M Hull
(
Imperial College
)
2:00 PM  3:00 PM
Room: 43006  TH Conference Room
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room
Thursday, August 6, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
alpha' corrections in double field theory

Olaf Hohm
(
MIT
)
alpha' corrections in double field theory
Olaf Hohm
(
MIT
)
10:30 AM  11:30 AM
Room: 43006  TH Conference Room
2:00 PM
Double extension of N=4 superYangMills theory

SooJong Rey
(
Seoul National University & IBS
)
Double extension of N=4 superYangMills theory
SooJong Rey
(
Seoul National University & IBS
)
2:00 PM  3:00 PM
Room: 43006  TH Conference Room
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room
3:30 PM
Exceptional geometry and Borcherds superalgebras

Jakob Palmkvist
(
Texas A&M University
)
Exceptional geometry and Borcherds superalgebras
Jakob Palmkvist
(
Texas A&M University
)
3:30 PM  4:00 PM
Room: 43006  TH Conference Room
I will consider generalized diffeomorphisms in exceptional geometry from an algebraic point of view. By extending the Uduality algebra E_n to an infinitedimensional Lie superalgebra of Borcherds type, the generalized Lie derivatives can be expressed in a simple way, and the expression takes the same form for any n<8. The closure of the transformations then follows from the Jacobi identity and other fundamental properties of this Borcherds superalgebra.
Friday, August 7, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
Consistent ScherkSchwarz compactifications using exceptional field theory

Emanuel Malek
(
LMU Munich
)
Consistent ScherkSchwarz compactifications using exceptional field theory
Emanuel Malek
(
LMU Munich
)
10:30 AM  11:30 AM
Room: 43006  TH Conference Room
We discuss 7dimensional maximal gauged supergravities arising from ScherkSchwarz compactifications using exceptional field theory. We show how to map consistent compactifications of 10dimensional type IIA theory into consistent compactifications of 10dimensional type IIB theory and vice versa and show how this map transforms the resultant gaugings of the 7dimensional embedding tensor. We use this map to extend the known consistent compactifications of10dimensional type IIA theory on hyperboloidal spaces $H^{p,q}$ to compactifications of 10dimensional type IIB theory on such $H^{p,q}$ spaces.
2:00 PM
E8 geometry

Martin Cederwall
E8 geometry
Martin Cederwall
2:00 PM  3:00 PM
Room: 43006  TH Conference Room
We investigate exceptional generalised diffeomorphisms based on E_8(8) in a geometric setting. The transformations include gauge transformations for the dual gravity field. The surprising key result, which allows for a development of a tensor formalism, is that it is possible to define fielddependent transformations containing connection, which are covariant. We solve for the spin connection and construct a curvature tensor. A geometry for the Ehlers symmetry SL(n + 1) is sketched. Some related issues are discussed. If time allows I will also discuss solution (and relaxation) of the section condition in terms of a twistor transform in a firstquantised setting.
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room
Saturday, August 8, 2015
Sunday, August 9, 2015
Monday, August 10, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
New gaugings and nongeometry

Charles StricklandConstable
(
CEA Saclay
)
New gaugings and nongeometry
Charles StricklandConstable
(
CEA Saclay
)
10:30 AM  11:00 AM
Room: 4/3006  TH Conference Room
11:00 AM
Conserved charges in double field theory

Chris Blair
(
University of Cambridge
)
Conserved charges in double field theory
Chris Blair
(
University of Cambridge
)
11:00 AM  11:30 AM
Room: 43006  TH Conference Room
2:00 PM
Solutions in Extended Field Theories

Felix Rudolph
(
Queen Mary London
)
Solutions in Extended Field Theories
Felix Rudolph
(
Queen Mary London
)
2:00 PM  2:30 PM
Room: 43006  TH Conference Room
I will present solutions to Double Field Theory and Exceptional Field Theory and show that the string is a null wave in DFT and the NS5brane is a monopole. Extending these solutions to EFT where Sduality is part of the symmetry group gives a single selfdual solution combining both the wave and a monopole. Through taking different choices of the section condition, this solution yields all the 1/2 BPS solutions in Mtheory.
2:30 PM
Doubledyetgauged and twofold spin groups

JeongHyuck Park
(
Sogang University
)
Doubledyetgauged and twofold spin groups
JeongHyuck Park
(
Sogang University
)
2:30 PM  3:00 PM
Room: 43006  TH Conference Room
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room
3:30 PM
Supersymmetric gauged DFT

Jose J. FERNANDEZMELGAREJO
(
Harvard University
)
Supersymmetric gauged DFT
Jose J. FERNANDEZMELGAREJO
(
Harvard University
)
3:30 PM  4:00 PM
Room: 43006  TH Conference Room
In a systematic and geometric way, we derive maximal and halfmaximal supersymmetric gauged double field theories in lower than ten dimensions. To this end, we apply a simple twisting ansatz to the D=10 ungauged maximal and halfmaximal supersymmetric double field theories constructed previously. The twisting ansatz may not satisfy the section condition. In addition, the maximal supersymmetric twist requires an extra condition to ensure both the RamondRamond gauge symmetry and the 32 supersymmetries unbroken. Based on http://arxiv.org/abs/1505.01301
4:00 PM
4:00 PM  5:00 PM
Room: 43006  TH Conference Room
Tuesday, August 11, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
Weakly Constrained Double Field Theory

Kanghoon Lee
(
Korea Institute for Advanced Study
)
Weakly Constrained Double Field Theory
Kanghoon Lee
(
Korea Institute for Advanced Study
)
10:30 AM  11:30 AM
Room: 43006  TH Conference Room
2:00 PM
TBA

Edvard Musaev
(
Higher School of Economics, Faculty of Mathematics, Moscow
)
TBA
Edvard Musaev
(
Higher School of Economics, Faculty of Mathematics, Moscow
)
2:00 PM  2:30 PM
Room: 43006  TH Conference Room
2:30 PM
Double Sigma Model

ChenTe Ma
(
National Taiwan University
)
Double Sigma Model
ChenTe Ma
(
National Taiwan University
)
2:30 PM  3:00 PM
Room: 43006  TH Conference Room
Double sigma model with strong constraints is equivalent to the ordinary sigma model by imposing a selfduality relation. The gauge symmetries are the diffeomorphism and oneform gauge transformation with the strong constraints. We combine the antisymmetric background field with the field strength to redefine the generalized metric. We use this generalized metric to construct a consistent double sigma model with boundary conditions. We also give comments to noncommutative geometry in the double sigma model.
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room
3:30 PM
Holographic Entanglement entropy and central charge in CFT's

Mohsen Alishahiha
(
IPM Teheran
)
Holographic Entanglement entropy and central charge in CFT's
Mohsen Alishahiha
(
IPM Teheran
)
3:30 PM  4:00 PM
Room: 43006  TH Conference Room
4:00 PM
4:00 PM  5:00 PM
Room: 43006  TH Conference Room
Wednesday, August 12, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
Gauging of 2D sigma models without isometry and genuinely nongeometric backgrounds from 3D sigma models.

Athanasios CHATZISTAVRAKIDIS
(
Leibnitz University Hannover
)
Gauging of 2D sigma models without isometry and genuinely nongeometric backgrounds from 3D sigma models.
Athanasios CHATZISTAVRAKIDIS
(
Leibnitz University Hannover
)
10:30 AM  11:30 AM
Room: 43006  TH Conference Room
In this talk we discuss two problems in the context of sigma models motivated by recent studies in Tduality and nongeometry. The first problem refers to the gauging of 2D sigma models when there is no isometry available, while the second regards the possibility to construct genuinely nongeometric backgrounds with the aid of 3D sigma models. In both cases the underlying mathematical framework is the theory of Lie and Courant algebroids, which will be presented in the first part of the talk. Then we shift our attention to a general class of 2D theories called Dirac sigma models and present a novel way to gauge such theories. This gauging is useful in formulating Tduality even when there is no isometry. Finally we discuss the correspondence between Courant algebroids and AKSZ membrane models with boundary. A certain class of such theories offers the possibility to construct nongeometric models which do not possess a geometric dual.
2:00 PM
Metastring theory

Rob Leigh
(
University of Illinois
)
Metastring theory
Rob Leigh
(
University of Illinois
)
2:00 PM  3:00 PM
Room: 43006  TH Conference Room
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room
Thursday, August 13, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
Enhanced gauge symmetry and winding states in Double Field Theory

Jose Alejandro ROSABAL RODRIGUEZ
(
Universidad de Buenos Aires
)
Enhanced gauge symmetry and winding states in Double Field Theory
Jose Alejandro ROSABAL RODRIGUEZ
(
Universidad de Buenos Aires
)
10:30 AM  11:30 AM
Room: 43006  TH Conference Room
2:00 PM
Ugravity for SL(N)

Yoonji Suh
(
Sogang University
)
Ugravity for SL(N)
Yoonji Suh
(
Sogang University
)
2:00 PM  3:00 PM
Room: 43006  TH Conference Room
We construct a duality manifest gravitational theory for the special linear group, SL(N) with N≠4. The spacetime is formally extended, to have the dimension 12N(N−1), yet is `gauged'. Consequently the theory is subject to a section condition. We introduce a semicovariant derivative and a semicovariant `Riemann' curvature, both of which can be completely covariantized after symmetrizing or contracting the SL(N) vector indices properly. Fully covariant scalar and `Ricci' curvatures then constitute the action and the `Einstein' equation of motion. For N≥5, the section condition admits duality inequivalent two solutions, one (N−1)dimensional and the other threedimensional. In each case, the theory can describe not only Riemannian but also nonRiemannian backgrounds.
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room
Friday, August 14, 2015
10:00 AM
coffee break
coffee break
10:00 AM  10:30 AM
Room: 42011  TH common room
10:30 AM
Codimension two solutions in fivedimensional supergravity

Masaki Shigemori
(
Kyoto University
)
Codimension two solutions in fivedimensional supergravity
Masaki Shigemori
(
Kyoto University
)
10:30 AM  11:30 AM
Room: 43006  TH Conference Room
We study a new class of supersymmetric solutions in fivedimensional supergravity representing multicenter configurations of codimension2 branes along arbitrary curves. Codimension2 branes are produced in generic situations out of ordinary branes of higher codimension by the supertube effect and, when they are exotic branes, spacetime generally becomes nongeometric. The solutions are characterized by a set of harmonic functions on R^3 with nontrivial monodromies around codimension2 branchpoint singularities. The solutions can be regarded as generalizations of the BatesDenef/BenaWarner multicenter solutions with codimension3 centers to include codimension2 ones. We present some explicit examples of solutions with codimension2 centers, and discuss their relevance for the black microstate (non)geometry program. ref: 1505.05169
3:00 PM
coffee break
coffee break
3:00 PM  3:30 PM
Room: 42011  TH common room