[en] A general equivalence between functional techniques and canonical quantization for a simple self-interacting scalar theory is proposed. Vacuum instability for the symmetric ((phi) = 0) and nonsymmetric cases is analysed in detail
Journal
Nuovo Cimento. A; ISSN 0369-3546; 
; v. 82(3); p. 275-291
; v. 82(3); p. 275-291
[en] By using a variational method we find that, in the space of gaussian trial wave functionals, lambdaPHI4 theory undergoes spontaneous symmetry breaking. Comparison between effective potential methods and second quantization of the hamiltonian suggests a simple many-body interpretation of the phenomenon. (orig.)
Journal
Nuclear Physics. B; ISSN 0550-3213; ; v. 254(3/4); p. 653-677
; v. 254(3/4); p. 653-677