Flowing with the temporal renormalization group

Abstract:

We discuss the far-from-equilibrium evolution of ${\varphi }^3$ theory in $1+1$ dimensions with the temporal functional renormalization group. In particular, we show that this manifestly causal approach leads to novel one-loop exact equations for fully dressed correlation functions. Within this setup, we numerically compute the dynamical propagator. Its behavior suggests self-similarity far from equilibrium in a restricted momentum regime. We discuss the scaling exponents for our solution, as well as the numerical satisfaction of energy and particle number conservation. We also derive a simple exact representation of the expectation value of the energy-momentum tensor solely in terms of the propagator.

L. Corell, A. K. Cyrol, M. Heller, J. M. Pawlowski, “Flowing with the temporal renormalization group”, Phys. Rev. D 104, 025005 (2021).

https://journals.aps.org/prd/abstract/10.1103/PhysRevD.104.025005

Related to Project B03