Graduate School in Physics and Astrophysics
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ANNUAL REPORT
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name: Riccardo Finotello
email: riccardo.finotello@to.infn.it
ciclo: XXXIII
year completed (1,2 or 3): 2
supervisor: Igor Pesando
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GRADUATE SCHOOL COURSES
(only completed courses, with examination passed in the year)
code: 01
title: Introducing Susy
teacher: Igor Pesando
hours: 20
code: 02
title: Introduction to large N-limit
teacher: Marco Panero
hours: 20
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SUMMER SCHOOLS, INTERNATIONAL SCHOOLS
(only those attended in the current year)
title: LACES 2018 - Lezioni Avanzate di Campi e Stringhe
place: Firenze, Italy
webpage: http://laces.web.cern.ch/laces/LACES18/index18.html
days: 19 (Nov 26th - Dec 14th)
talk or poster (Y/N): N
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CONFERENCES, WORKSHOP
(only those attended in the current year)
title: String Theory From a Worldsheet Perspective
place: Firenze, Italy
webpage: https://www.ggi.infn.it/showevent.pl?id=289
days: 5 (Mar 25th - Mar 29th)
talk (Y/N): N
poster (Y/N): N
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Research activity/Publications in the current year
(max characters 2500)
During my second year of the Ph.D. programme I worked in the field of String Theory and Boundary Conformal Field Theory. Specifically I investigated particle physics scenarios involving twists of the boundary conditions near D-branes intersecting at an angle.
This peculiar geometry is a viable model to study particle interactions through the separation of the classical contribution to the correlation functions and their quantum fluctuations. We were able to generalise the geometrical setup involved in the definition of the former through the study of the monodromy matrices of tensor products of hypergeometric functions. Moreover we showed how to recover the very specific cases found in the literature from our general procedure [1].
We are now in the way of studying the quantum contributions due to the presence of spin fields in a fermionic CFT in the presence of defects in the time direction. We were able to find a new way to compute the correlation functions of spin fields which recovers the usual results found in the literature. This new procedure may be a major step forward in the computation of the correlation functions of twist fields.
At the same time I am involved in the analysis of time-dependent orbifolds in String Theory and QFT as viable models of Big Bang-like singularities. Starting from the divergences appearing in the closed string (gravitational) sector on these orbifolds, we study the same divergences arising in the open sector, due to electromagnetic interactions. The cause of the divergences is therefore hidden in the structure of the orbifolds and needs to be addressed through the study of the motion of charged particles in the space, as it is not a simple matter of gravitational divergences as most of the time argued in the literature.
Finally I covered the tutoring sessions for the course "Mechanics" in the Bachelor degree (roughly 20 hours of lectures).
[1] R. Finotello, I. Pesando, 'The classical solution for the Bosonic string in the presence of three D-branes rotated by arbitrary SO(4) elements', Nucl. Phys. B 941 (2019) 158-194, arXiv:1812.04643