TFI 2017 <br> Theories of the Fundamental Interactions

Contribution List

0. Brane supersymmetry breaking, non-linear supersymmetry and some applications

Augusto Sagnotti (SNS - PI)

11/09/2017, 14:30

I shall review how String Theory leads to an intriguing phenomenon, "brane supersymmetry breaking", whereby supersymmetry is broken at the string scale in D=10 with no order parameter to recover it. The phenomenon is accompanied by the emergence of a runaway potential that destabilizes the original Minkowski vacuum, but whose specific form affords potentially interesting indications for...

1. Models of broken supersymmetry with constrained superfields

Niccolo' Cribiori (Univ. Padova)

11/09/2017, 15:15

An effective description for theories with spontaneous supersymmetry breaking can be obtained by imposing constraints on superfields, both for global and local supersymmetry. In particular, even if the supersymmetry breaking scale is assumed to be very high, superspace methods can still be used to study effective theories in the low energy regime, where some of the degrees of freedom can...

2. The Higgs branch of 6d N=(1,0) theories at infinite coupling

Dr Noppadol Mekareeya (University of Milano-Bicocca)

11/09/2017, 16:30

This talk focuses on vacuum moduli spaces of 6d N=(1,0) field theories that have a superconformal fixed point at infinite coupling. Such theories admit an effective description in terms of a quiver diagram, which can be realised using Type IIA string theory or F-theory at finite coupling. We show that several aspects of the hypermultiplet moduli space, also known as the Higgs branch, of...

3. Exact results in N=2 Super Yang-Mills Theories with defects

Marialuisa Frau (TO)

11/09/2017, 17:15

We study the non-perturbative behaviour of superconformal gauge theories with rigid N=2 supersymmetry in four dimensions, in particular N=2* theories, in presence of two-dimensional defects and discuss the relation between their S-duality properties and the possibility of computing exact quantum observables. For these theories, the prepotential and the twisted chiral superpotential, that...

4. Force Free Electrodynamics in a Black Hole Background

Marta Orselli (Perugia Univ.)

12/09/2017, 09:30

In Nature there are several astrophysical systems surrounded by a magnetosphere with a plasma that can be described using the so-called force-free electrodynamics (FFE). This is the case for example of black hole magnetospheres. By analyzing the stationary axisymmetric magnetosphere surrounding a spinning black hole, Blandford and Znajek realized that one could extract energy from a...

5. De Sitter instability and corpuscular nature of gravity

Wolfgang Mueck (NA)

12/09/2017, 10:15

6. Non-analyticity of holographic Renyi entropy in Lovelock gravity

Razieh Pourhasan (INFN Firenze)

12/09/2017, 11:30

Non-analyticity of holographic Renyi entropy in Lovelock gravity Abstract: We compute holographic Renyi entropies for spherical entangling surfaces on the boundary while considering third order Lovelock gravity with negative cosmological constant in the bulk. Our study shows that third order Lovelock black holes with hyperbolic event horizon are unstable, and at low temperatures those...

7. Fibre inflation models and moduli-space sizes

David Ciupke (University of Bologna)

12/09/2017, 12:15

In this talk we summarize recent results regarding the global embedding of fibre inflation models. In these models, being based on Calabi-Yau orientifold models of IIB where partial moduli stabilization is achieved in the Large Volume Scenario (LVS), the role of the Kahler cone is special as it determines the geometry of the moduli space. Furthermore, we report on separate research aimed...

8. A journey through Wilson loops in 3D Chern-Simons-matter theories

Silvia Penati (MIB)

12/09/2017, 14:30

I will review some recent results concerning BPS Wilson loops in 3D N=6 ABJ(M) and N=4 Chern-Simons-matter theories, with particular focus on their role in testing AdS/CFT correspondence and integrability underlying it.

9. N=4 Amplitudes/Wilson loops at strong coupling from integrability

Alfredo Bonini (BO)

12/09/2017, 15:15

N=4 Super Yang-Mills is a supersymmetric and conformal gauge theory with remarkable properties. Among them, its duality with a IIB string theory in the AdS5xS5 background and the correspondence between null polygonal Wilson loops and gluon scattering amplitudes. Even more surprisingly, some integrable features pop up when computing a certain class of observables in the theory. For instance,...

10. K3 string theories, symmetries and wall crossing

Roberto Volpato (Univ. Padova)

12/09/2017, 16:30

I will consider a large class of four dimensional N=4 string models obtained from compactifications of type II string theory on K3 x T^2 and orbifolds thereof. I will show that the multiplicities of 1/4 BPS states in such models can be determined (almost) uniquely by imposing some simple consistency condition. The main ingredient in this derivation is a careful analysis of the wall...

15. Monitoring Italian Strings & Gender

Anna Ceresole, Silvia Penati (MIB)

12/09/2017, 17:15

As a follow up of the Outreach & Gender activities of COST "The String Theory Universe", ended in march, we propose to assess the situation and continue monitoring the growth of the women community working in String Theory and related areas. We open the discussion to comments, suggestions, initiatives.

16. Cena Sociale

12/09/2017, 20:00

11. Exotic branes and non-geometric fluxes in string theory

Fabio Riccioni (ROMA1)

13/09/2017, 09:30

We obtain a complete classification of the half-supersymmetric branes of IIA/IIB string theory compactified on tori based on non-perturbative dualities. Many of these branes are `exotic', in the sense that they do not arise from the dimensional reduction of branes in ten dimensions. We then consider a specific N=1 model in four dimensions with fluxes turned on, and we determine the subset of...

12. Lagrangians for Argyres-Douglas theories, unitarity bound violations and 3d Abelianization

Sergio Benvenuti (SISSA)

13/09/2017, 10:15

We consider 4d N=1 Lagrangians dual to N=2 Argyres-Douglas models. The N=1 gauge theories have chiral ring operators with small r-charge, that violate the unitarity bound. We propose a general procedure to UV-complete such theories, isolating the infrared interacting SCFT. This allows to reduce the dualities to 3d and find two physical interpretations: the 'Abelianization duality' and its 3d...

13. Strings on Melvin Spaces and the Omega Background

Carlo Angelantonj (Univ. Torino)

13/09/2017, 11:30

I shall present recent results on the quantum corrections of gauge couplings for N=2 SYM theories emerging from D-Branes on Melvin spaces, and their connection with the perturbative free energy of N=2 theories on the Omega background.

14. Large-N CP(N-1) sigma model on a finite interval and the renormalized string energy

Kenichi Konishi (PI)

13/09/2017, 12:15

We continue the analysis started in a recent paper of the large-N two-dimensional CP(N-1)sigma model, defined on a finite space interval L with Dirichlet (or Neumann) boundary conditions. We focus our attention on the problem of the renormalized energy density E(x,Λ, L) which is found to be a sum of two terms, a constant term coming from the sum over modes, and a term proportional to the...