{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,4,3]],"date-time":"2022-04-03T12:59:12Z","timestamp":1648990752459},"reference-count":6,"publisher":"World Scientific Pub Co Pte Lt","issue":"05","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Mod. Phys. E"],"published-print":{"date-parts":[[1999,10]]},"abstract":"<jats:p> First-order approximation of the number-projected (NP) SO(2N) Tamm-Dancoff (TD) equation is developed to describe ground and excited states of superconducting fermion systems. We start from an NP Hartree-Bogoliubov (HB) wave function. The NP SO(2N) TD expansion is generated by quasi-particle pair excitations from the degenerate geminals in the number-projected HB wave function. The Schr\u00f6dinger equation is cast into the NP SO(2N) TD equation by the variation principle. We approximate it up to first order. This approximate equation is reduced to a simpler form by the Schur function of group characters which has a close connection with the soliton theory on the group manifold. <\/jats:p>","DOI":"10.1142\/s0218301399000318","type":"journal-article","created":{"date-parts":[[2003,5,7]],"date-time":"2003-05-07T08:18:55Z","timestamp":1052295535000},"page":"461-483","source":"Crossref","is-referenced-by-count":0,"title":["FIRST-ORDER APPROXIMATION OF THE NUMBER-PROJECTED SO(2N) TAMM-DANCOFF EQUATION AND ITS REDUCTION BY THE SCHUR FUNCTION"],"prefix":"10.1142","volume":"08","author":[{"given":"SEIYA","family":"NISHIYAMA","sequence":"first","affiliation":[{"name":"Centro de F\u00edsica Te\u00f3rica, Universidade de Coimbra, 3000 - Coimbra, Portugal"},{"name":"Department of Physics, Kochi University, Kochi 780-8520, Japan"}]}],"member":"219","published-online":{"date-parts":[[2012,1,25]]},"reference":[{"key":"p_1","doi-asserted-by":"publisher","DOI":"10.1070\/PU1959v002n02ABEH003122"},{"issue":"1995","key":"p_4","first-page":"181","volume":"582","author":"Rowe T. Song","year":"1991","journal-title":"Nucl. Phys."},{"issue":"1994","key":"p_5","first-page":"1139","volume":"35","author":"Littlewood The","year":"1958","journal-title":"J. Math. Phys."},{"issue":"1979","key":"p_7","first-page":"343","volume":"15","author":"\u00d6hrn Int","year":"1977","journal-title":"Int. J. Quantum Chem."},{"issue":"1982","key":"p_12","first-page":"5388","volume":"76","author":"Fukutome Prog","year":"1975","journal-title":"J. Chem. Phys."},{"issue":"1994","key":"p_13","first-page":"1139","volume":"35","author":"Nishiyama Prog","year":"1981","journal-title":"J. Math. Phys."}],"container-title":["International Journal of Modern Physics E"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.worldscientific.com\/doi\/pdf\/10.1142\/S0218301399000318","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,8,7]],"date-time":"2019-08-07T14:33:26Z","timestamp":1565188406000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.worldscientific.com\/doi\/abs\/10.1142\/S0218301399000318"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1999,10]]},"references-count":6,"journal-issue":{"issue":"05","published-online":{"date-parts":[[2012,1,25]]},"published-print":{"date-parts":[[1999,10]]}},"alternative-id":["10.1142\/S0218301399000318"],"URL":"https:\/\/doi.org\/10.1142\/s0218301399000318","relation":{},"ISSN":["0218-3013","1793-6608"],"issn-type":[{"value":"0218-3013","type":"print"},{"value":"1793-6608","type":"electronic"}],"subject":[],"published":{"date-parts":[[1999,10]]}}}