Our group hosts several different weekly activities. We have a series of regular seminars on Wednesdays at 15:00 in Room S named High Energy Theory Seminars (orange in the calendar), replaced by Theory Colloquia (yellow) once per month.
We also have informal discussions on Tuesdays in Room R, alternating between the Pheno-Coffee (pink) and the Theory-lunch (green).
If you have iCal, you can have our seminars added automatically to your calendars by subscribing (⌥⌘S) to the address http://active.pd.infn.it/g4/jccal.php.
Calendar of next month's seminars
|A. Van Proeyen|
|Conformal symmetry and Supergravity: Einstein equations and currents|
Conformal symmetry is the maximal spacetime symmetry. Nearly 50 years ago Callan-Coleman-Jackiw wrote a historical paper where the properties of conserved currents of conformal-invariant actions where clarified. Supergravity was found 40 years ago, and played since then an important role in the developments of quantum theories with gravity as in superstring theory. Considering supergravity as a broken superconformal theory lead to many insights in the structure of supergravity. We review these developments and report on a recent investigation on the Einstein equation and conserved currents in a supergravity theory from the conformal point of view.
|The Power of Series|
After a small review on divergent series and Borel resummation I will discuss a geometric approach based on Picard-Lefschetz theory to study the interplay between perturbative and non-perturbative effects in the QM path integral. Such approach can be used to characterize when the perturbative series gives the full answer and when the inclusion of non-trivial saddles--instantons--is mandatory. I will then show how a simple deformation of the original perturbation theory allows to recover the full non perturbative answer from the perturbative coefficients alone, without the need of including instanton corrections. I will illustrate this technique in examples which are known to contain non-perturbative effects, such as the (supersymmetric) double-well potential, the pure anharmonic oscillator, and the perturbative expansion around a false vacuum
|Niccolo Cribiori||Non-linear realizations and constrained superfields||Aula R|