Remarks on the appearance of ghost states in relativistic field theories
A subtraction procedure to eliminate ghosts from propagators recently proposed by bedmond is examined from the standpoint of axionnatic field theory. This procedure is found to be equivalent to the introduction of a special vertex function which in principle can be chosen among functions having the analyticity properties prescribed by the axioms. This situation is shown to exist both in the case of boson and fermion fields. In the discussion Lehmann integral representation of propagators is taken as an axiom by itself. The modifications brought into the discussion of ghost problems by a subtracted Lehmann dispersion formula are then examined. Of some interest are the consequences on the high frequency behavior of form factors.
- Research Organization:
- Universita, Rome
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-023503
- OSTI ID:
- 4161474
- Journal Information:
- Nuovo Cimento, Journal Name: Nuovo Cimento Journal Issue: 5 Vol. 16; ISSN 0029-6341
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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