Journal article

Publication year: 2020

Journal: Nuclear Physics B

Volume number: 950

ISSN: 0550-3213

eISSN: 1873-1562

Open access status: Gold

DOI Link: https://doi.org/10.1016/j.nuclphysb.2019.114868

Publisher: Elsevier

Abstract: 
We calculate spectral functions of the relativistic O (4) model from real-time lattice simulations in classical-statistical field theory. While in the low and high temperature phase of the model, the spectral functions of longitudinal (sigma) and transverse (pi) modes are well described by relativistic quasi-particle peaks, we find a highly non-trivial behavior of the spectral functions in the cross over region, where additional structures appear. Similarly, we observe a significant broadening of the quasi-particle peaks, when the amount explicit O (4) symmetry breaking is reduced. We further demonstrate that in the vicinity of the O (4) critical point, the spectral functions develop an infrared power law associated with the critical dynamics, and comment on the extraction of the dynamical critical exponent z from our simulations. (C) 2019 The Authors. Published by Elsevier B.V.

Harvard Citation style: Schlichting, S., Smith, D. and von Smekal, L. (2020) Spectral functions and critical dynamics of the O (4) model from classical-statistical lattice simulations, Nuclear Physics B, 950, Article 114868. https://doi.org/10.1016/j.nuclphysb.2019.114868

APA Citation style: Schlichting, S., Smith, D., & von Smekal, L. (2020). Spectral functions and critical dynamics of the O (4) model from classical-statistical lattice simulations. Nuclear Physics B. 950, Article 114868. https://doi.org/10.1016/j.nuclphysb.2019.114868