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10-12 April 2019
Denver, CO
US/Mountain timezone

Renormalization of n-particle irreducible effective actions

11 Apr 2019, 14:25
Director's Row J (Denver, CO)

Director's Row J

Denver, CO

Sheraton Denver Downtown Hotel, 1550 Court Pl. lobby level of the Plaza building
contributed talk Theoretical Approaches


Prof. Margaret Carrington (Brandon University)


The n-particle irreducible effective action is a powerful approach to study non-perturbative systems. The method provides a systematic expansion for which the truncation occurs at the level of the action. At the 2PI level one can renormalize using a complicated procedure which involves introducing multiple sets of counterterms, but the method cannot be extended to higher orders. We have developed a method based on a renormalization group approach which allows us to construct a renormalized theory at any order in the nPI approximation. We present results from a calculation using a scalar theory with quartic coupling in 4 dimensions, at the 4 loop level. Both the 2PI and 4PI theories can be renormalized using one bare coupling constant and one bare mass, which are introduced at the level of the Lagrangian.

Primary author

Prof. Margaret Carrington (Brandon University)

Presentation Materials