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Quantum fields without Wick rotation by Baldazzi, Alessio; Percacci, Roberto; Skrinjar, Vedran is a scholarly article available to read on EtoBox.

What is Quantum fields without Wick rotation about?

We discuss the calculation of one-loop effective actions in Lorentzian spacetimes, based on a very simple application of the method of steepest descent to the integral over the field. We show that for static spacetimes this procedure agrees with the analytic continuation of Euclidean calculations. We also discuss how to calculate the effective action by integrating a renormalization group equation. We show that the result is independent of arbitrary choices in the definition of the coarse-graining and we see again that the Lorentzian and Euclidean calculations agree. When applied to quantum gravity on static backgrounds, our procedure is equivalent to analytically continuing time and the integral over the conformal factor.

Author

Baldazzi, Alessio; Percacci, Roberto; Skrinjar, Vedran

Published

2019

Language

EN