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This research investigates the non-equilibrium dynamics of a quantum scalar field following a mass quench, specifically analyzing how interference between counter-propagating fluctuation wave fronts distorts the effective mass in finite-size systems. The study provides theoretical insights into spatio-temporal correlation evolution within the light cone under periodic boundary conditions, advancing our understanding of fundamental quantum field behaviors.
Mass quench in interacting finite-size quantum field system
arXiv:2610.12045v1 Announce Type: cross Abstract: In this work, we theoretically investigate the non-equilibrium evolution of the correlation functions of a quantum scalar field following a mass quantum quench in a finite-size system. The self-consistent equation for the Keldysh (statistical) correlation function is solved numerically in the one-loop approximation. A specific spatio-temporal effect is observed: at a point in time approximately equal to half the system size, the effective mass experiences a strong disturbance. It is shown that this effect is driven by the interference of counter-propagating wave fronts of fluctuations that propagate within the light cone and is induced by periodic boundary conditions.
Abstract:In this work, we theoretically investigate the non-equilibrium evolution of the correlation functions of a quantum scalar field following a mass quantum quench in a finite-size system. The self-consistent equation for the Keldysh (statistical) correlation function is solved numerically in the one-loop approximation. A specific spatio-temporal effect is observed: at a point in time approximately equal to half the system size, the effective mass experiences a strong disturbance. It is shown that this effect is driven by the interference of counter-propagating wave fronts of fluctuations that propagate within the light cone and is induced by periodic boundary conditions.
High Energy Physics - Theory (hep-th); Statistical Mechanics (cond-mat.stat-mech); High Energy Physics - Phenomenology (hep-ph); Quantum Physics (quant-ph)
arXiv:2610.12045 [hep-th]
(or arXiv:2610.12045v1 [hep-th] for this version)
https://doi.org/10.48550/arXiv.2610.12045 arXiv-issued DOI via DataCite (pending registration)
Full text under the publisher's open licence · 131 words
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