Thermal representations in group field theory: squeezed vacua and quantum gravity condensates

Journal of High Energy Physics

Mehdi Assanioussi¹  Isha Kotecha² 

[1] II. Institute for Theoretical Physics, University of Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany;Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Am Mühlenberg 1, 14476, Potsdam-Golm, Germany;Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489, Berlin, Germany;

关键词: Models of Quantum Gravity;    Nonperturbative Effects;    Thermal Field Theory;   

DOI  :  10.1007/JHEP02(2020)173

来源: Springer

【 摘 要 】

We apply the formalism of thermofield dynamics to group field theory quantum gravity and construct thermal representations associated with generalised equilibrium Gibbs states using Bogoliubov transformations. The newly constructed class of thermal vacua are entangled, two-mode squeezed, thermofield double states. The corresponding finite temperature representations are inequivalent to the standard zero temperature one based on a degenerate vacuum. An interesting class of states, coherent thermal states, are defined and understood as thermal quantum gravity condensates.

【 授权许可】

CC BY