Tachyonic quench in a free bosonic field theory
Abstract
We present a characterization of a bosonic field theory driven by a free (Gaussian) tachyonic Hamiltonian. This regime is obtained from a theory describing two coupled bosonic fields after a regular quench. Relevant physical quantities such as simple correlators, entanglement entropies, and the mutual information of disconnected subregions are computed. We show that the causal structure resembles a critical (massless) quench. For short times, physical quantities also resemble critical quenches. However, exponential divergences end up dominating the dynamics in a very characteristic way. This is related to the fact that the low-frequency modes do not equilibrate. Some applications and extensions are outlined.
Keywords
Cite
@article{arxiv.1711.01326,
title = {Tachyonic quench in a free bosonic field theory},
author = {Sebastian Montes and Javier Rodríguez-Laguna and Germán Sierra},
journal= {arXiv preprint arXiv:1711.01326},
year = {2018}
}
Comments
9 pages, 6 figures, 2 appendices. v2: A brief section on possible connections to physical systems is included