EVENTI
Mercoledì 4 giugno pv., alle ore 15:00 in aula F1, prenderà il via il ciclo di lezioni rivolto a studenti della laurea magistrale e del dottorato in Fisica e Nanoscienze (Corso "Special Topics in Theoretical Physics") e tenuto dal Dott. Giovanni Chirilli dal titolo:
“Scattering Amplitudes, Spinor Helicity, and the Double Copy: From Gauge Theory to Gravitational Waves”
Descrizione Lezioni:
This lecture series explores modern techniques for computing scattering amplitudes, with a focus on the spinor helicity formalism, on-shell recursion, and their powerful extensions to gravity via the
double copy. Starting from spinor helicity in four dimensions, we show how it efficiently encodes polarization data and greatly simplifies the structure of amplitudes for massless particles. We then develop on-shell methods such as BCFW recursion and unitarity cuts, which bypass the complexity of Feynman diagrams and expose hidden symmetries and dualities in gauge theories.
A central topic is the double copy construction, which relates gauge theory amplitudes to gravitational ones by replacing color structures with kinematic ones. This duality not only simplifies calculations in gravity, but also reveals deep connections between the symmetries of gauge theories, the geometry of general relativity, and ideas that originate in string theory.
We conclude with applications to classical gravitational dynamics, where these tools contribute to the post-Minkowskian expansion of the two-body problem. These developments are crucial for producing accurate predictions of gravitational waveforms from inspiraling compact objects, as needed by detectors such as LIGO, Virgo, and the Einstein Telescope, which will probe gravity in previously inaccessible regimes of precision and energy.