Quantum properties of supersymmetric gauge theories

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Presentation transcript:

Quantum properties of supersymmetric gauge theories Speaker: Alessandro Banaudi Tutor: Alberto Santambrogio Co-tutor: Andrea Mauri

What is a supersymmetric gauge theory? Supersymmetry + Quantum field theory which describes elementary particles and their fundamental interactions. The fields considered are invariant under gauge transformations. A space-time symmetry that relates two classes of elementary particles: bosons (integer-valued spin) and fermions (half-integer-valued spin). PARTICLES SUPERPARTICLES BOSONS FERMIONS Examples: QED, QCD, ...

Why are these theories interesting? Physics beyond Standard Model. Cancellations between bosonic and fermionic divergences. Large amount of symmetries. Some subsectors are exactly solvable (integrable). A possible springboard to quantum gravity through AdS/CFT correspondence.

The central role of N = 4 SYM N = 4 SYM is the pioneer of the supersymmetric gauge theories. It is a maximally supersymmetric gauge theory. It is a quantum conformal field theory. It is integrable in some limits. Its strong coupling regime corresponds to the supergravity limit of the string theory in a AdS background.

N = 4 SYM is the starting point. We are mainly interested in 2 different theories: N = 2 SCQCD (4 dimensions); ABJM theory (3 dimensions). N = 2 SCQCD N = 4 SYM QCD AdS/CFT ABJM theory Gravity AdS/CFT

The research project N = 2 SCQCD ABJM Computation of scattering amplitudes. Properties of amplitudes and symmetries. Relations amplitudes/Wilson loops. ABJM Computation of scattering amplitudes. Computation of the dilatation operator. Integrability.

In the computation of scattering amplitudes, we use the formalism of Feynman (super)diagrams. We read from the action the Feynman rules for propagators and vertices of the theory; We build all the possible diagrams (until the perturbative order considered) for the considered process; We compute one by one the diagrams.

Main goals In N = 2 SCQCD, we will compare some properties of scattering amplitudes with the corresponding ones in N = 4 SYM and in QCD. In ABJM, we will compute the dilatation operator at 6 loops in order to test a recent proposal based on integrability.

Thank you for your attention