TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysCore.7.3.066
TI  - Bogoliubov phonons in a Bose-Einstein condensate from the one-loop perturbative renormalization group
PY  - 2024/09/27
UR  - https://scipost.org/SciPostPhysCore.7.3.066
JF  - SciPost Physics Core
JA  - SciPost Phys. Core
VL  - 7
IS  - 3
SP  - 066
A1  - Rasch, Niklas
AU  - Mikheev, Aleksandr
AU  - Gasenzer, Thomas
AB  - Wilson's renormalization-group approach to the weakly-interacting single-component Bose gas is discussed within the symmetry-broken, condensate phase. Extending upon the work by Bijlsma and Stoof, wave-function renormalization of the temporal derivative contributions to the effective action is included in order to capture sound-like quasiparticle excitations with wave lengths larger than the healing-length scale. By means of a suitable rescaling scheme we achieve convergence of the coupling flows, which serve as a means to determine the condensate depletion in accordance with Bogoliubov theory, as well as the interaction-induced shift of the critical temperature.
ER  -

@Article{10.21468/SciPostPhysCore.7.3.066,
	title={{Bogoliubov phonons in a Bose-Einstein condensate from the one-loop perturbative renormalization group}},
	author={Niklas Rasch and Aleksandr N. Mikheev and Thomas Gasenzer},
	journal={SciPost Phys. Core},
	volume={7},
	pages={066},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhysCore.7.3.066},
	url={https://scipost.org/10.21468/SciPostPhysCore.7.3.066},
}