Seminars



Friday, 6 November, 2015 - 14:30 - 15:30
Aula Grassano

Nazario Tantalo (University of  Rome Tor Vergata) 

 

" Electrically charged hadrons on a finite volume"



Abstract: Precision tests of the Standard Model can only be performed by taking into account QED corrections to hadronic physical quantities. This is possible by means of lattice simulations once a coherent description of electrically-charged states in finite volume has been provided. In the usual periodic setup, Gauss's law and large gauge transformations forbid the propagation of electrically-charged states. In this talk I discuss a solution to the long-standing problem of charged particles on a finite volume that does not violate the axioms of local quantum field theory. The solution is based on the use of charge-conjugation boundary conditions. A certain class of electrically-charged states can be constructed in a fully consistent fashion in this setup, without relying on gauge fixing. This class of states covers most of the interesting phenomenological applications in the framework of numerical simulations. 




Friday, 13 November, 2015 - 14:30 - 15:30
Aula Grassano

A. Polosa (Sapienza Universita’ di Roma and INFN) & G.C. Rossi (Universita’ di Roma Tor Vergata and INFN - Sezione di Tor Vergata)

"Tetraquarks, pentaquarks and the like: old and new views"

Abstract: In this talk we will provide a chronological history of the discovery and the interpretation of tetraquarks and pentaquarks states, pointing out old and more recent theoretical developments concerning their spectrum and decay modes.




Monday, 16 November, 2015 - 14:30 - 15:30
Aula Grassano

Maxim Khlopov ( Université Paris 7, Laboratoire APC, France.)



  "  Nuclear interacting dark atoms" 




Friday, 27 November, 2015 - 14:30 - 15:30
Aula Grassano

Lionel Mason (University of Oxford, UK) 

Title: Ambitwistor strings and the scattering equations at one loop 

 

Abstract:  Ambitwistor strings are holomorphic string theories whose target space is the space of complex null geoedesics in a complexified space-times.  I will explain how these theories explain the origin of the scattering equations  in twistor strings and the CHY formulae in arbitrary dimensions and provide a reformulation of standard gauge,  gravity and other theories in a holomorphic infinite tension analogue of conventional string theories.  I will show how these results extend to 1-loop both on a torus and on a nodal Riemann sphere in a scheme that potentially extends to all loops.




Friday, 11 December, 2015 - 14:30 - 15:30
Aula Grassano

Gabriele Veneziano (CERN - 1211 Geneva 23, Switzerland)

 

 "Recent developments in high energy gravitational scattering" 




Monday, 14 December, 2015 - 14:30 - 15:30
Aula Grassano

Gianluca Inverso (Nikhef, Amsterdam, The Netherlands )

 "All rigid N=2 backgrounds in four dimensions"




Friday, 18 December, 2015 - 14:30 - 15:30
Aula Grassano

 Stefano Marchesani (University of Oxford, United Kingdom)

 

 "Hydrodynamic limit of a hamiltonian system in smooth regime."




Monday, 18 January, 2016 - 14:30 - 15:30
Aula Paoluzi

Stefano Giusto (University of Padova)

"Holography for black hole microstates"




Monday, 1 February, 2016 - 14:30 - 15:30
Aula Grassano

Oliver Schlotterer  (Max Planck, Munich, Germany)



``The number theory of superstring amplitudes’’




Wednesday, 3 February, 2016 - 14:30 - 15:30
Aula Grassano

Tassos Petkou  (Aristotle University of Thessaloniki, Greece)



"New results on the epsilon expansion"