@article{oai:u-ryukyu.repo.nii.ac.jp:02006951,
 author = {Ginoza, Mitsuaki and Kanazawa, Hideo and 宜野座, 光昭 and 金沢, 秀夫},
 issue = {16},
 journal = {琉球大学理工学部紀要. 理学編, Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural sciences},
 month = {Mar},
 note = {The neutral system consisting of charged-bosons and -fermions has been investigated in terms of density parameter expansion at the high-density limit. The ground state energy of this system is calculated and accords with the result obtained in our previous work. The elementary excitations in the system determined from the poles of the boson Green's function are the two collective excitations in the low momentum region : acoustic- and optical-phonon like. The life-time of the acoustic phonon approaches infinite as s/v_f →0 where s and v_f arc the sound velocity and Fermi velocity, respectively, while that of the optical pbonon is infinite., 紀要論文},
 pages = {58--72},
 title = {The Field Theoretical Treatment of the Charged-Boson and –Fermion System : Ground State Energy and Elementary Excitations},
 year = {1973}
}