Seminars



Monday, 27 April, 2015 - 13:30 - 15:00
Aula Grassano

Jan Troost (Ecole Normale Superieure, Paris, France)

 "Modularity in Elliptic Integrable systems and N=1* theory




Monday, 4 May, 2015 - 14:30 - 15:30
Aula Grassano
Sameer Murthy (King's College, London, U.K.) 

 "Exact quantum black hole  entropy and localization in supergravity" 

 




Thursday, 7 May, 2015 - 14:30 - 15:30
Aula Grassano

 "Universal formulae for thermo-electric transport in the

presence of a magnetic field"



We obtain explicit expressions for the thermo-electric transport coefficients of a strongly coupled planar medium in the presence of an orthogonal magnetic field and disorder. The computations are performed within the gauge/gravity framework, however we propose and argue for a possible universal relevance of the results relying on comparisons and extensions of previous hydrodynamical analyses and experimental data.




Friday, 8 May, 2015 - 14:30 - 15:30
Aula Grassano

Daniele Musso ( ICTP, Trieste Italy)

"Charge and heat diffusion bounds for momentum dissipating strongly coupled systems"



Inspired by a recent conjectured universal bound for thermo-electric diffusion constants in quantum critical, strongly coupled systems and relying on holigraphic analytical computations, we investigate the possibility of formulating Planckian bounds in different holofraphic models featuring momentum dissipation. For a simple massive gravity dilaton model at zero charge density we found robust linear in T resistivity and entropy alongside a constant susceptibility. These conditions realize the phenomenoligical basis on which the diffusion bounds were conjectured furnishing arguments for the existence of the bounds themselves.




Monday, 11 May, 2015 - 14:30 - 15:30
Aula Grassano

Francesco Nozzoli  (INFN & ASI-ASDC)

Title "AMS-02 results after 4 years of operation on ISS"

Abstract: AMS-02 is a magnetic spectrometer operating on the International Space Station since May 2011. More than 60 billion events have been collected by the instrument in the first 4 years of data taking.  40 billion events have been partially analysed to perform accurate
measurements of the energy spectra and abundances of the different Cosmic Rays components. The detector properties and the results will be presented.
 
 




Friday, 15 May, 2015 - 14:30 - 15:30
Aula Paoluzi

 Norma Susana Mankoč Borštnik (University of Ljubljana, Faculti of Mathematics and Physics, Ljubljana)

Title:  " The spin-charge-family theory offers the explanation for the assumptions of the standard model, for the dark matter "  

Abstract:  The standard model of quarks, leptons and electroweak and colour interactions, which brought a new and elegant understanding into physics of elementary particles and fields, is built on phenomenological recognitions. Theoreticians try to explain the assumptions of the standard model by groups containing as subgroups the groups used to describe so far observed charges. Also families are tried to be explained in a similar way, while equations of motion are chosen to manifest these symmetries. 



The spin-charge-family theory starts in d= (13+1) with a simple action for spinors (fermions), which carries only two kinds of spins - the Dirac kind and the second kind, connected with the multiplication of Clifford objects from the left and the right hand side, respectively - and for the corresponding gravity of two kinds of spin connection fields and the vielbeins. One kind of spins manifests in (3+1) the spin and all the charges of quarks and leptons as assumed by the standard model, while the corresponding spin connections explain the origin and properties of all the known gauge fields. The second kind of spins explains the appearance of families. Spin connections of both origins explain the origin of the Higgs scalar and Yukawa couplings. 

The theory - offering the explanation for the appearance of all the properties of quarks and leptons and for the existing vector and scalar fields – offers also the explanation for the origin of the dark matter and the matter-antimatter asymmetry in our universe. 



In the spin-charge-family theory are all the spin connection fields with the scalar space index (s > 3) with respect to the space index in the fundamental representations, while they are with respect to other quantum numbers (like the family quantum numbers) in the adjoint representations. Correspondingly the theory explains the origin of the R parity and the weak and the hyper charge of the Higgs’s scalar, as well as the Yukawa couplings. 



The theory predicts the fourth family to be measured at the LHC and also several new scalar fields. It also predicts how will the 3x3 submatrix of the 4x4 quarks mixing matrix change in more accurate measurements. It predicts that the stable of from the lower four decoupled group of four families form the dark matter and that the scalar fields offer the explanation for the matter-antimatter asymmetry in our universe. 




Tuesday, 19 May, 2015 - 15:00 - 16:00
Aula Grassano

Ignatios Antoniadis (Albert Einstein Center, Bern University, Switzerland)

Title:  "Aspects of string phenomenology in particle physics and cosmology  




Friday, 22 May, 2015 - 14:30 - 15:30
Aula Grassano

Noppadol Mekareeya (CERN, Geneva Switzerland)

 "Instanton partition functions" 




Wednesday, 27 May, 2015 - 16:00 - 17:00
Aula Grassano

Alberto Lerda (University of Turin and INFN)

title: "Instantons in Field  and String Theory"

Abstract:I will present a general introduction to instantons in gauge theories and discuss their relevance and their main properties. I will also describe how these non-perturbative field configurations can be embedded in string theory and show how this stringy description provides a unifying description and suggests interesting generalizations, also with possible phenomenological applications.




Monday, 15 June, 2015 - 14:30 - 16:00
Aula Paoluzi

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

 "Scattering amplitudes of supersymmetric gauge theories I"