Seminars



Wednesday, 17 June, 2015 - 11:00 - 12:30
Aula Fisica della Materia

Yu-tin  Huang (Institute for Advance Studies -  Princeton,   USA) 

 "Scattering amplitudes of supersymmetric gauge theories II" 




Wednesday, 17 June, 2015 - 14:30 - 16:00
Aula Fisica della materia

Yu-tin  Huang (Institute for Advance Studies -  Princeton,   USA) 

 "Scattering amplitudes of supersymmetric gauge theories III" 




Friday, 19 June, 2015 - 14:30 - 15:30
Aula Paoluzi

Leopoldo Pando Zayas (ICTP Italy, Michigan USA)

 "Holography and Disorder"




Monday, 22 June, 2015 - 14:30 - 15:30
Aula Grassano

Leopoldo Pando Zayas (ICTP Italy, Michigan USA

 "String Inflation"




Wednesday, 23 September, 2015 - 14:30 - 15:30
Aula di riunione

Leopoldo Pando Zayas (ICTP, Trieste)

"Gravitational collapse and turbulence in String Theory"




Monday, 5 October, 2015 - 14:30 - 15:30
Aula Paoluzi

   Dr. Dhritiman Nandan (Humboldt University at Berlin, Germany)



     “Hidden structures in the form factors of N=4 SYM”

       Monday 5 October 2015, 14:30 - 15:30

        Aula Paoluzi, Dept. of Physics, Tor Vergata University




Thursday, 8 October, 2015 - 14:30 - 15:30
Sala Struttura della Materia (Dipartimento di Fisica)

Prof. Patricio Clark di Leoni (Departamento de Física - Fac. de Ciencias Exactas y Naturales Universidad de Buenos Aires (Argentina)

“The spatio-temporal spectrum of turbulent flows”

Abstract

Understanding the interplay between waves and eddies is of crucial importance in many turbulent flows, ranging from geophysical to astrophysical ones. But, identification and extraction of vortical structures and of waves in a disorganized flow is a mayor challenge. We present a study of the spatio-temporal behavior of turbulent flows in the presence of different restitutive forces. Four cases are considered: rotating turbulence, stratified turbulence, water wave turbulence, and quantum turbulence. For rotating and for stratified turbulence, the spectrum allows identification of the waves, quantification of the energy in the waves and in the turbulent eddies, and identification of physical mechanisms such as Doppler shift and wave absorption in critical layers. For water wave turbulence the spectrum shows a transition from gravity-capillary waves to bound waves as the amplitude of the forcing is increased. Finally, in quantum turbulence we are able to directly detect the much sought after Kelvin waves. 




Friday, 16 October, 2015 - 14:30 - 15:30
Aula Grassano

Tassos Petkou (Institute of Theoretical Physics, Aristotle University of Thessaloniki)

" Vector-Model Holography"

 
Abstract: I will discuss aspects of the holographic description of  O(N) vector models. Emphasis will be given in understanding the holographic interpretation of their global symmetry breaking mechanism. Understanding this, allows us to make conjecture regarding the nature of higher-spin theories dual to vector model: namely that they are the collective description of bulk singletons.
 



Wednesday, 21 October, 2015 - 15:30 - 16:30
Aula Grassano

 

Tassos Petkou (Institute of Theoretical Physics, Aristotle University of Thessaloniki)

 "From CFT to AdS and back".




Friday, 23 October, 2015 - 14:30 - 15:30
Aula Grassano

Eric Carlen (Rutgers University, USA)



Title: "A Quantum Kac Walk and its Kinetic Limit"



Abstract: We present recent results on models for quantum systems of N particles undergoing random binary collisions, focusing on propagation of chaos and the rate of convergence to equilibrium. These questions arise from the work of Mark Kac and his investigation into the probabilistic structure underlying the Boltzmann equation. Recently, the quantum mechanical variation on Kac's question has begun to be investigated. In this case, the Kac Master equation becomes an evolution equation of Lindblad type, while the corresponding Boltzmann equation is a novel sort of non-linear evolution equation for a density matrix.There are novel difficulties due to the fact that in quantum mechanics, conditional probability is not always well-defined. Nonetheless, a substantial quantum analog of of the Kac program can be carried out, and this leads to an interesting and novel class of quantum kinetic equations. This is joint work with Michael Loss and Maria Carvalho.