Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Progress of Theoretical Physics

Density Matrix and New Configuration Space

Toshiyuki Nishiyama

Published Feb 1, 1950• 1 citation
Publisher

Abstract

Progress of Theoretical Physics Vol. 5 No. 6 (1950) pp. 909-919 An Algebraic Theory of the Density Matrix, I Kodi Husimi and Toshiyuki Nishiyama
DOI
10.1143/ptp/5.1.135

Related papers

Density Matrix and New Configuration Space

T. Nishiyama

Progress of Theoretical Physics Vol. 5 No. 6 (1950) pp. 909-919 An Algebraic Theory of the Density Matrix, I Kodi Husimi and Toshiyuki Nishiyama

Progress of Theoretical Physics•Jan 1, 1951•0 citations

An Algebraic Theory of the Density Matrix, II

Toshiyuki Nishiyama

Progress of Theoretical Physics Vol. 6 No. 3 (1951) pp. 366-378 Note on Many Fermion Problems Toshiyuki Nishiyama

Progress of Theoretical Physics•Feb 1, 1951•2 citations

Second Configuration Space and Third Quantization

Yasusada Nambu

Progress of Theoretical Physics Vol. 4 No. 3 (1949) pp. 331-346 On the Method of the Third Quantization Yôichirô Nambu Progress of Theoretical Physics Vol. 5 No. 1 (1950) pp. 135-137 Density Matrix and New Configuration Space T. Nishiyama

Progress of Theoretical Physics•Jul 1, 1950•3 citations

Density Matrix Theories in Quantum Physics

BENTHAM SCIENCE PUBLISHERS eBooks•Nov 2, 2020•2 citations

On the Velocity Operator in Quantum Mechanics

Toshiyuki Nishiyama

Progress of Theoretical Physics Vol. 8 No. 6 (1952) pp. 655-668 A Quantum Theory of Boson Assemblies, I Toshiyuki Nishiyama Progress of Theoretical Physics Vol. 27 No. 3 (1962) pp. 600-607 Collective Description of a System of Interacting Bose Particles. II Sigenobu Sunakawa, Hiroshi Nakatani and Yoshimatsu Yoko-o Progress of Theoretical Physics Vol. 52 No. 6 (1974) pp. 1784-1797 A Long-Range Attractive Interaction of Rotons in Superfluid 4He Toshiyuki Nishiyama and Shunkichi Sai Progress of Theoretical Physics Vol. 53 No. 2 (1975) pp. 386-399 On the Validity of Collective Variable Description of Bose Systems Minoru Takahashi Progress of Theoretical Physics Vol. 53 No. 5 (1975) pp. 1243-1266 On the Collective Variables in Many-Boson System Shuichiro Yamasaki, Takeji Kebukawa and Sigenobu Sunakawa Progress of Theoretical Physics Vol. 54 No. 2 (1975) pp. 384-395 Ground-State Energy of a Many-Boson System Toshiyuki Nishiyama Progress of Theoretical Physics Vol. 54 No. 2 (1975) pp. 597-599 Momentum Distribution of an Interacting Many-Boson System Toshiyuki Nishiyama Progress of Theoretical Physics Vol. 56 No. 2 (1976) pp. 375-395 A Microscopic Theory of the Interacting Bose System Shosuke Sasaki and Kiyohisa Matsuda Progress of Theoretical Physics Vol. 57 No. 2 (1977) pp. 393-409 Collective Variable Approach to Many-Boson Systems at High Density Toshiyuki Nishiyama and Masakazu Tsujii Progress of Theoretical Physics Vol. 62 No. 6 (1979) pp. 1487-1498 Generalized Solutions to the Gross-Pitaevskii Equation Masakazu Ichiyanagi Progress of Theoretical Physics Vol. 64 No. 4 (1980) pp. 1248-1264 Bose-Einstein Condensation and the Canonical Conjugates to the Density Fluctuations Shuichiro Yamasaki and Masahiko Hirooka Progress of Theoretical Physics Vol. 64 No. 5 (1980) pp. 1565-1576 Momentum Distribution and Ground-State Energy of Liquid 4He at the Absolute Zero Temperature Toshiyuki Nishiyama and Yoiti Watanabe Progress of Theoretical Physics Vol. 67 No. 3 (1982) pp. 726-742 On the Hydrodynamical Model for a Bose Liquid at T=0 Masakazu Ichiyanagi and Masato Ohya Progress of Theoretical Physics Vol. 68 No. 5 (1982) pp. 1482-1503 Quasi-Particle Description of a Degenerate System of Bosons Masahiko Hirooka and Shuichiro Yamasaki

Progress of Theoretical Physics•Apr 1, 1952•10 citations

Matrix Form of Quantum Mechanics. Perturbation Theory. Density Matrix

WORLD SCIENTIFIC eBooks•Sep 27, 2016•0 citations
Progress of Theoretical Physics Vol. 8 No. 6 (1952) pp. 655-668 A Quantum Theory of Boson Assemblies, I Toshiyuki Nishiyama Progress of Theoretical Physics Vol. 27 No. 3 (1962) pp. 600-607 Collective Description of a System of Interacting Bose Particles. II Sigenobu Sunakawa, Hiroshi Nakatani and Yoshimatsu Yoko-o Progress of Theoretical Physics Vol. 52 No. 6 (1974) pp. 1784-1797 A Long-Range Attractive Interaction of Rotons in Superfluid 4He Toshiyuki Nishiyama and Shunkichi Sai Progress of Theoretical Physics Vol. 53 No. 2 (1975) pp. 386-399 On the Validity of Collective Variable Description of Bose Systems Minoru Takahashi Progress of Theoretical Physics Vol. 53 No. 5 (1975) pp. 1243-1266 On the Collective Variables in Many-Boson System Shuichiro Yamasaki, Takeji Kebukawa and Sigenobu Sunakawa Progress of Theoretical Physics Vol. 54 No. 2 (1975) pp. 384-395 Ground-State Energy of a Many-Boson System Toshiyuki Nishiyama Progress of Theoretical Physics Vol. 54 No. 2 (1975) pp. 597-599 Momentum Distribution of an Interacting Many-Boson System Toshiyuki Nishiyama Progress of Theoretical Physics Vol. 56 No. 2 (1976) pp. 375-395 A Microscopic Theory of the Interacting Bose System Shosuke Sasaki and Kiyohisa Matsuda Progress of Theoretical Physics Vol. 57 No. 2 (1977) pp. 393-409 Collective Variable Approach to Many-Boson Systems at High Density Toshiyuki Nishiyama and Masakazu Tsujii Progress of Theoretical Physics Vol. 62 No. 6 (1979) pp. 1487-1498 Generalized Solutions to the Gross-Pitaevskii Equation Masakazu Ichiyanagi Progress of Theoretical Physics Vol. 64 No. 4 (1980) pp. 1248-1264 Bose-Einstein Condensation and the Canonical Conjugates to the Density Fluctuations Shuichiro Yamasaki and Masahiko Hirooka Progress of Theoretical Physics Vol. 64 No. 5 (1980) pp. 1565-1576 Momentum Distribution and Ground-State Energy of Liquid 4He at the Absolute Zero Temperature Toshiyuki Nishiyama and Yoiti Watanabe Progress of Theoretical Physics Vol. 67 No. 3 (1982) pp. 726-742 On the Hydrodynamical Model for a Bose Liquid at T=0 Masakazu Ichiyanagi and Masato Ohya Progress of Theoretical Physics Vol. 68 No. 5 (1982) pp. 1482-1503 Quasi-Particle Description of a Degenerate System of Bosons Masahiko Hirooka and Shuichiro Yamasaki