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List of participants

• Paolo Aschieri (U. Piemonte Orientale)

  Constitutive Relations and Self-Duality Conditions

  We present a systematic study of nonlinear and higher derivatives extensions of electromagnetism. We clarify when action functionals S[F] can be explicitly obtained from arbitrary (not necessarily self-dual) nonlinear equations of motion. We show that the “Deformed twisted self-duality condition” proposal originated in the context of supergravity counterterms is actually the general framework needed to discuss self-dual theories starting from a variational principle. We generalize to nonlinear and higher derivatives theories Schr ̈odinger formu- lation of Born-Infeld theory, and for the latter, and more in general for nonlinear theories, we derive a closed form expression of the corresponding deformed twisted self-duality conditions. This implies that the hypergeometric expression entering these duality conditions and leading to Born-Infeld theory satisfies a hidden quartic equation.

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• Stefano Bellucci (INFN-LNF) chair

  The quest for N=2 supersymmetric Born-Infeld action

  We analyze the exact perturbative solution of N = 2 Born-Infeld theory which is believed to be defined by Ketov’s equation. This equation can be considered as a truncation of an infinite system of coupled differential equations defining Born-Infeld action with one manifest N = 2 and one hidden N = 2 supersymmetries. We explicitly demonstrate that infinitely many new structures appear in the higher orders of the perturbative solution to Ketov’s equation. Thus, the full solution cannot be represented as a function depending on a finite number of its arguments. We propose a mechanism for generating the new structures in the solution and show how it works up to 18-th order. Finally, we discuss two new superfield actions containing an infinite number of terms and sharing some common features with N = 2 supersymmetric Born-Infeld action.

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• Eric Bergshoeff (University of Groningen)

  Vector Branes

  In this talk I wil review the classification of the half-supersymmetric branes of maximal and half-maximal supergravity. I will put an empasis on ``vector branes'', i.e. branes whose worldvolume dynamics is described by a single vector multiplet whose worldvolume Lagrangian is of the Dirac-Born-Infeld-Volkov-Akulov type.

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• Guillaume Bossard (Ecole Polytechnique)

  Supersymmetry invariants and anomalies in N=4 supergravity

  I shall discuss the structure of the supersymmetry invariants of N=4 supergravity coupled to n vector multiplets with up to eight derivatives. In particular, I will discuss in details their superspace construction, and their transformation property with respect to SL(2). I shall also discuss the associated chiral anomaly, and its consequences in supergravity and string theory.

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• Johannes Broedel (ETH Zürich)

  N=2 supersymmetry and U(1) duality

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• Ioseph Buchbinder (Department of Theoretical Physics, Tomsk State Pedagogical University, Russia)

  CONSTRUCTION OF EFFECTIVE ACTION FOR N = 2, d = 3 SUPERSIMMETRIC FIELD THEORIES

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• John Joseph Carrasco (Stanford Institute for Theoretical Physics)

  Duality: abelian gauge theories, N=8 and N=4 SG

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• Martin Cederwall (Fundamental physics, Chalmers Univ. of Technology, Gothenburg, Sweden)

  The simplicity of maximally supersymmetric field theories

  I will discuss the structure of some manifestly maximally supersymmetric field theories in the pure spinor framework. The formalism has a natural Batalin-Vilkovisky structure which makes it suitable for quantisation. The order of interaction terms are generically lower than in the component actions. For D=11 supergravity, D=10 abelian Born-Infeld theory and their dimensional reductions, the action is polynomial.

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• Ariunzul Davgadorj (BLTP, JINR)
• Tristan Dennen (Niels Bohr Institute)

  Perturbative Ultraviolet Calculations in Supergravity

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• Paolo Di Vecchia (Nordita, Stockholm)

  High energy scattering of closed strings on a N Dp branes

  We consider the scattering of a closed string on a stack of N Dp branes as a function of the energy E of the incoming string and of the transfer momentum. It turns out that the tree diagrams are divergent at high energy violating unitarity. Unitarity is recovered by summing over loop corrections obtaining the so-called eikonal operator. This operator is then used for computing the deflection angle in the metric of the stack of N Dp branes as a function of the impact parameter b and the tidal forces acting on the string at any order in \alpha'/b^2. We show that the curved space-time structure generated by the Dp branes emerge from calculations done in flat Minkowski space. Then, we consider the motion of the string in the metric of a stack of N Dp branes at high energy and we show that the leading term for large impact parameter agrees with the one obtained from the eikonal operator at any order in \alpha'/b^2.

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• Sergio Ferrara (CERN)

  Dualities, Ehlers and Form Cosets

  We classify the enhanced helicity symmetry of the Ehlers group in extended supergravity in D dimension.Pseudo-Riemannian cosets occurring in this analysis have vanishing signature.They describe physical form fields and their magnetic dual.

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• Henrik Johansson (CERN)

  Towards Determining the UV Behavior of Maximal Supergravity

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• Renata Kallosh (Stanford University)

  Issues in N=4, N=8 supergravity, UV properties dualities, amplitudes

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• Anna Karlsson (Fundamental physics, Chalmers Univ. of Technology, Gothenburg, Sweden)
• Michael Koehn (Albert-Einstein-Institut, Potsdam, Germany)

  Scalars with higher derivatives in supergravity and cosmology

  We construct N=1 supergravity extensions of scalar field theories with higher-derivative kinetic terms. Special attention is paid to the auxiliary fields, whose elimination leads not only to corrections to the kinetic terms, but to new expressions for the potential energy as well. Our formalism allows one to write a supergravity extension of any higher-derivative scalar field theory and therefore has applications to both particle physics and cosmological model building. For instance, the ghost condensate vacuum spontaneously breaks local supersymmetry without the super-Higgs effect taking place. Supersymmetric Galileons are shown to imply equations of motion of higher than second order, thus leading to the appearance of ghosts.

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• Sergey Krivonos (BLTP, JINR, Dubna)

  Partial Breaking of Global Supersymmetry in d=1

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• Emanuele Latini (University of Zurich)
• Raffaele Marotta (INFN - Napoli)
• Alessio Marrani (ITF, KU Leuven)
• Suresh Nampuri (LPTENS, Paris, France)
• Hermann Nicolai

  The non-linear flux ansatz for maximal supergravity

• Bengt EW Nilsson (Chalmers, Gothenburg)

  Solutions of topologically gauged theories with 8 supersymmetries in 3d

  We discuss the topologically gauging of the global symmetries of BLG theories for M2-branes, and explain how this leads to entirely new superconformal field theories in 3d with SO(N) gauge group for any N. These latter theories are then higgsed resulting in a breaking of the superconformal symmetries. Some of the background solutions are critical and these will be analysed here in more detail. Some comments on a possible "sequential AdS/CFT" scenario are also provided.

• Burt Ovrut (University of Pennsylvania)

  The Ghost Condensatein N=1 Supergravity

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• Vanhove Pierre (IPhT CEA-Saclay and IHES)

  String theory approach to UV divergences in supergravity

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• Fabio Riccioni (INFN Roma La Sapienza)
• George Ruppeiner (New College of Florida)

  Thermodynamic curvature and black holes

  What does thermodynamics tell us about a system’s character at the microscopic level? Could the thermodynamic curvature R lend insight into this question? This question is particularly relevant for black hole thermodynamics, where consensus on any microscopic “atomic” foundation is lacking. In ordinary thermodynamic systems, the magnitude of R gives fluctuating mesoscopic structure sizes, and the sign of R indicates whether the interactions between particles or spins are repulsive or attractive. It might be productive to apply these ideas to black hole thermodynamics. I compare R for several cases of ordinary fluid and spin systems with those for black hole thermodynamics, with special emphasis on fermions, bosons, and anyons.

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• Andrey Shcherbakov (LNF INFN) org. committee member
• Kelly Stelle (Imperial College London)

  N=4 and N=8 Supergravity Counterterms

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• Anton Sutulin (BLTP, JINR, Dubna) org. committee member
• Antoine Van Proeyen (KU Leuven)

  Superconformal symmetry and higher-derivative Lagrangians

  I will first review the possibilities of the superconformal methods for the constructions of Lagrangians and indicate in which theories they can be applied. In the search for possible higher-derivative actions, much has still to be discovered. I will also present a construction in rigid supersymmetry based on the Dirac-Born-Infeld-Volkov-Akulov action as an example of an all-order higher-derivative action.

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• Armen Yeranyan (LNF INFN) org. committee member