University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Friday, February 5th 2016
Speaker: Adrian Escobar (UNAM)
Subject: Instanton calculus in quantum mechanics: quartic double-well and sine-Gordon potentials.

In this talk we discuss two quantum mechanical problems, the
quartic double-well and the sine-Gordon potentials.
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.

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