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Instanton calculus in quantum mechanics: quartic double-well and sine-Gordon potentials


por el

Dr. Adrián Escobar


University of Minnesota

Resumen:
In this talk we discuss specific problems for which perturbation theory fails to explain physical properties even qualitatively. We then explain how non-perturbative effects can be obtained by instanton calculus. Feynman diagrams in the instanton background are used for the calculation of the tunneling amplitude (the instanton density) in the three-loop order. Unlike the two-loop contribution where all involved Feynman integrals are rational numbers, we will show that in the three-loop case they can contain irrational contributions as well.

Miércoles 29 de junio de 2016
18:00 hrs.
Salón 203, Edificio Anexo, IIMAS

Informes: coloquiomym@gmail.com, o al 5622-3564.