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I found Theorem 9.2 because I was also working at the time in constructive quantum field theory which was then studying the simplest interacting field models (varphi ^4_2) and (P varphi )_2) (the subscript 2 means two space time dimensions).
B c is the coercivity field, B u is the interacting field between particles.
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Therefore, various results that were established for free fields can still be used in the case of interacting fields.
Segal notes this advantage in response to a result obtained by (Haag 1955), that field theory representations of free fields are unitarily inequivalent to representations of interacting fields.
Second, if the Fock space representation is not apt to describe interacting systems, then the unitarily equivalent wave functional representation is in no better situation: Interacting fields are unitarily inequivalent to free fields, too.
Using the interaction picture is advantageous because the equations of motion as well as, under certain conditions, the commutation relations are the same for interacting fields as for free fields.
With its enormous interacting gravitational fields, the binary pulsar should emit such waves, and the resulting energy drain should reduce the orbital distance between the two stars.
The two stars' enormous interacting gravitational fields affect the regularity of the radio pulses, and, by timing these and analyzing their variations, Taylor and Hulse found that the stars were rotating ever faster around each other in an increasingly tight orbit.
This can be used for calculating correlation functions of systems of interacting stochastic fields.
The polarization effects originate from changes in covalency due to Si Si, Si C, and C C interacting electric fields.
The polarization effects originate from changes in covalency due to Sr Sr, Sr X, and X X interacting electric fields.
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