Non-Gaussian Entanglement Renormalization for Quantum Fields

Abstract

In this work, a non-Gaussian cMERA tensor network for interacting quantum field theories (icMERA) is presented. This consists of a continuous tensor network circuit in which the generator of the entanglement renormalization of the wavefunction is nonperturbatively extended with nonquadratic variational terms. The icMERA circuit nonperturbatively implements a set of scale dependent nonlinear transformations on the fields of the theory, which suppose a generalization of the scale dependent linear transformations induced by the Gaussian cMERA circuit. Here we present these transformations for the case of self-interacting scalar and fermionic field theories. Finally, the icMERA tensor network is fully optimized for the $\lambda {\varphi }^4$ theory in $(1+1)$ dimensions. This allows us to evaluate, nonperturbatively, the connected parts of the two- and four-point correlation functions. Our results show that icMERA wavefunctionals encode proper non-Gaussian correlations of the theory, thus providing a new variational tool to study phenomena related with strongly interacting field theories.

v2: (43 pages) substantial improvement to the optimization procedure of the circuit for the ${\varphi }^4$ model (Section 5.3). A new appendix is added to illustrate what are the features of the ground state of the $\lambda {\varphi }^4$ theory that captured by the icMERA tensor network. Accepted for publication in JHEP

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