Gauge-Invariant Formulation of Adiabatic Self-Consistent Collective Coordinate Method
Abstract
The adiabatic self-consistent collective coordinate (ASCC) method is a practical microscopic theory of large-amplitude collective motions in nuclei with superfluidity. We show that its basic equations are invariant against transformations involving the gauge angle in the particle-number space. By virtue of this invariance, a clean separation between the large-amplitude collective motion and the pairing rotational motion can be achieved, enabling us to restore the particle-number symmetry broken by the Hartree-Fock-Bogoliubov (HFB) approximation. We formulate the ASCC method explicitly in a gauge-invariant form. In solving the ASCC equations, it is necessary to fix the gauge. Applying this new formulation to the multi-O(4) model, we compare different gauge-fixing procedures and demonstrate that calculations using different gauges indeed yield the same results for gauge-invariant quantities, such as the collective path and quantum spectra. We suggest a gauge-fixing prescription that seems most convenient in realistic calculations.
Keywords
Cite
@article{arxiv.nucl-th/0701004,
title = {Gauge-Invariant Formulation of Adiabatic Self-Consistent Collective Coordinate Method},
author = {Nobuo Hinohara and Takashi Nakatsukasa and Masayuki Matsuo and Kenichi Matsuyanagi},
journal= {arXiv preprint arXiv:nucl-th/0701004},
year = {2011}
}
Comments
27 pages, 7 figures, submitted to Prog. Theor. Phys