Seminars



Tuesday, 3 March, 2015 - 14:30 - 15:30
Aula Grassano

Lucio Cerrito  (University of  Perugia, Italy)

Title: "Top Quark Physics: a perspective to 2020"   

Abstract: The discovery of the top quark 20 years ago set the beginning of a comprehensive study of its properties and dynamics both at the Tevatron collider in the USA, and more recently at CERN's Large Hadron Collider (LHC). The decay of the top as a free quark, but particularly its large mass of ~173 GeV/c2 make it still a special case amongst the fundamental particles.

Today, cosmological observations and theoretical arguments lead us to believe that new phenomenology, new particles, forces, or even a new space-time structure is waiting to be uncovered. Naturalness of the recently discovered Higgs boson suggests that new phenomena should appear at the TeV scale, and in most models these will be accompanied by modifications to the dynamics of the top quark.

In this talk I will discuss the basic phenomenology of top quarks, the experimental challenges, and the state of the art for the main observables, with examples from the ATLAS and CDF experiments. I will also present five key measurements that will be performed with the LHC Run II data by 2020 and that were recently retained for funding through an European Research Council (ERC) Consolidator grant. 




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

 Prof. Uriel Frisch (Observatoire de la Cote d'Azur CNRS - France)

“Time-analyticity of Lagrangian particle trajectories in ideal fluid flow governed by the Euler equations: historical and modern perspectives”

Abstract

Two prized papers, one by Augustin Cauchy in 1815, presented to the French Academy and the other by Hermann Hankel in 1861, presented to Goettingen University, contain major discoveries on vorticity dynamics whose impact is now quickly increasing.

(i) Cauchy found a Lagrangian formulation of 3D ideal incompressible flow in terms of three invariants that generalize to three dimensions the now well-known law of conservation of vorticity along fluid particle trajectories for two-dimensional flow. This has very recently been used by Zheligovsky and Frisch to prove analyticity in time of fluid particle trajectories for 3D incompressible Euler flow and can be extended to compressible flow, in particular to cosmological dark matter.

(ii) Hankel showed that Cauchy's formulation gives a very simple Lagrangian derivation of the Helmholtz vorticity- flux invariants and, in the middle of the proof, derived an intermediate result which is the conservation of the circulation of the velocity around a closed contour moving with the fluid. This circulation theorem was to be rediscovered independently by William Thomson (Kelvin) in 1869. Cauchy's invariants were only occasionally cited in the 19th century - besides Hankel, foremost by George Stokes and Maurice Levy - and even less so in the 20th until they were rediscovered via Emmy Noether's theorem in the late 1960, but reattributed to Cauchy only at the end of the 20th century by Russian scientists. 




Monday, 9 March, 2015 - 14:30 - 15:30
Aula Grassano

Ruben Minasian (IPhT CEA Saclay - Institut de Physique Théorique, Paris, France)

 "Heterotic strings and generalised geometry "




Wednesday, 11 March, 2015 - 14:30 - 15:30
Aula Grassano

Victor Penas (Univ. Groningen)
"Double field theory: Generalized fluxes and their geometry"

 




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

Krzysztof Cichy (Institut für Theoretische Physik

Johann Wolfgang Goethe-Universität,  Frankfurt am Main, Germany)

"Tensor network methods for lattice gauge theories"




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

Marcus Berg (Karlstad University - Sweden)

 "Graviton Loop Amplitudes in String Theory" on 15 March, 2015




Friday, 20 March, 2015 - 14:30 - 15:30
Aula Grassano

Davide Forcella (Université Libre de Bruxelles, Bruxelles, Belgique.)

 "Electromagnetic properties of charged viscous fluids: from string theory to electrons"




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

Raffaele Savelli (CEA Saclay, Paris, France)

 "F-theory on singular spaces" 




Friday, 3 April, 2015 - 14:30 - 15:30
Aula Conversi (Universita di Roma Sapienza)

Aritra Banerjee (Indian institute of Technology Kharagpur, West Bengal, India)

  "Aspects of semiclassical strings in one parameter deformed AdS"




Friday, 17 April, 2015 - 14:30 - 15:30
Aula Grassano

  Donal O'Connell (University of Edinburgh - School of Physics and Astronomy, University of Edinburgh,  United Kingdom)

 "The BCJ double copy & Kerr-Schild metrics"