The thermal expectation values of all possible bosonic generalised retarded functions evaluated at zero energy are studied. The relationships of such functions to calculational schemes, technical problems and physical applications are outlined. It is then shown that all generalised retarded functions constructed from any one set of bosonic fields are equal at zero energy. This is done completely generally and is not limited to any approximation scheme such as perturbation theory.
Nuclear Physics B
- Pub Date:
- February 1997
- High Energy Physics - Phenomenology
- 16 pages, LaTeX (no figures), available through anonymous ftp as LaTeX from ftp://euclid.tp.ph.ic.ac.uk/papers/94-5_26.tex or as LaTeX or postscript at http://euclid.tp.ph.ic.ac.uk/Papers/index.html