# Seminars

Friday, 12 February, 2016 - 14:30 - 15:30
Aula Paoluzi

"Holographic effective actions"

Monday, 7 March, 2016 - 14:30 - 15:30
Aula Grassano

Andrea Zanzi (Università di Ferrara)

"Metastable SUSY breaking and fractal quantum gravity in string theory"

Monday, 4 April, 2016 - 14:30 - 15:30
Aula Grassano

Gabriele Honecker (Johannes Gutenberg University, Mainz, Ge)

title: "From Type II String Theory towards Particle Physics, Moduli Stabilisation and the Dark Sector".

Wednesday, 13 April, 2016 - 14:00 - 15:00
Aula Paoluzi

Pascal Anastasopoulos (Technische Universität Wien, Vienna, Austria)

Title:  "Light Strings and the 1053 GeV diphoton excess"

Monday, 18 April, 2016 - 14:30 - 15:30
Aula Grassano

Inaki Garcia-Etxebarria  (Ludwig-Maximilians-Universitaet Muenchen Muenchen, Germany)

title: "Heterotic T-fects, 6D SCFTs and F-theory

Wednesday, 20 April, 2016 - 14:30 - 15:30
Aula Grassano

Bidisha Chakrabarty (Institute of Physics, Bhubaneswar, India)

Title:" On non-extremal smooth geometries and gravitational instantons"

Abstract: Extremal Black hole microstate geometries have been well studied in the context of the black hole information puzzle and fuzzball proposal. Non-extremal black hole microstates are much more interesting but less explored. Using the AdS/CFT prescription, we identify a general class of dual states of non-supersymmetric orbifolded D1-D5-P supergravity solutions (JMaRT). These general class of dual CFT states can be obtained by fractional spectral flow both in the left and right sectors. In the gravity side, these states correspond to the quantum degrees of freedom living in the cap region of the geometry. We compute the massless scalar emission spectrum and rate both in the gravity and CFT sides and show that they match perfectly, thus providing strong evidence for our identification. We also investigate the physics of ergoregion emission as a pair creation for these orbifolded solutions. We also discuss an alternative and more direct way to construct three charge, doubly rotating JMaRT solutions as charged Myers-Perry instantons. We present the inverse scattering construction of 5D MP instanton and add charges to it using appropriate $SO(4,4)$ hidden symmetry transformation. This construction is an extension and simplification of a previous work by Kleinschmidt et al.

Friday, 29 April, 2016 - 14:30 - 15:30
Aula Grassano

Stefano Liberati (SISSA, Trieste, Italia)

""Emergent gravity: condensed matter analogues, black holes and tests"

Monday, 9 May, 2016 - 14:30 - 15:30
Aula Grassano

Roberto Frezzotti (Universita di Roma "Tor Vergata")

Title:

Mass hierarchy and naturalness from TeV scale strong dynamics

Abstract:

A non-perturbative mechanism for dynamical generation of the mass of elementary particles, both fermions and weak bosons, is presented in a simplified gauge model. Within this framework, which is under test by numerical simulations, each particle's mass arises naturally in a certain chiral symmetry limit with a magnitude that is controlled by the strongest interaction the particle is subjected to. To accomodate top and weak boson masses, a new strong interaction with an intrinsic RGI scale of the TeV order must be postulated.

Monday, 16 May, 2016 - 14:30 - 15:30
Aula Grassano

Ricardo MEDINA ( Federal Universidad Itajubà, Brasile)

title:  “The revisited S-matrix methods in open superstring theory”

Friday, 20 May, 2016 - 14:30 - 15:30
Aula Grassano

Gilberto Colangelo  (   Institute for Theoretical Physics, Bern, Zwitzerland )

"Dispersive treatment of the hadronic light-by-light contribution to (g-2)_mu. "

Abstract: I will describe recent progress in approaching the calculation of the

hadronic light-by-light contribution to (g-2)_\mu with dispersive

methods. I will first discuss general properties of the four-point function of the electromagnetic current in QCD, its Lorentz decomposition and dispersive representation. For what concerns the pseudoscalar pole contributions, I will give an overview of the determination of the pseudoscalar transition form factors. I will then consider the pion-loop contribution and discuss the recently proposed Mandelstam representation thereof.