Double dispersion relations in quantum Statistical Mechanics-II

A. K. Rajagopal, Morrel H. Cohen

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Double dispersion relations are given for the functions {Mathematical expression} common in many electron problems. Here ψ and ψT refer to electron destruction and creation operators, and B (3) is a boson or boson-like operator such as particle density, ion displacement, local spin, particle current density, or electron spin density. Consequences of Hermiticity properties and time reversal invariance as well as sum rules are established for the spectral density functions entering the double dispersion relations. A subtracted double dispersion relation is suggested for the corresponding vertex function. Details of the derivation and examples are given which were not included in an earlier brief report of this work.

Original languageEnglish (US)
Pages (from-to)149-166
Number of pages18
JournalProceedings of the Indian Academy of Sciences - Section A
Issue number4
StatePublished - Apr 1970
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry


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