Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

Numerical Stochastic Perturbation Theory around instantons

Aug 11, 2022, 9:40 AM
20m
CP1-HSZ/1st-1.001 - HS5 (CP1-HSZ)

CP1-HSZ/1st-1.001 - HS5

CP1-HSZ

50
Oral Presentation Theoretical Developments and Applications beyond Particle Physics Theoretical Developments

Speaker

Paolo Baglioni (University of Parma (SMFI) and INFN)

Description

Numerical Stochastic Perturbation Theory (NSPT) has over the years proved to be a valuable tool, in particular being able to reach unprecedented orders for Lattice Gauge Theories, whose perturbative expansions are notoriously cumbersome. One of the key features of the method is the possibility to expand around non-trivial vacua.
While this idea has been around for a while, and it has been implemented in the case of the (non-trivial) background of the Schroedinger Functional, NSPT expansions around instantons have not yet been worked out. Here we present computations for the double well potential in Quantum Mechaniscs. We compute a few orders of the expansion of the ground state energy splitting in the one-instantons sector. We discuss how (already) known three-loop results are reproduced and present the current status of higher order computations.

Primary authors

Francesco Di Renzo (Università di Parma and INFN) Paolo Baglioni (University of Parma (SMFI) and INFN)

Presentation materials