Multiplication of Distributions and Nonperturbative Calculations of Transition Probabilities

In a mathematical context in which one can multiply distributions the "`formal"' nonperturbative canonical Hamiltonian formalism in Quantum Field Theory makes sense mathematically, which can be understood a priori from the fact the so called "`infinite quantities"' make sense unambiguously (but are not classical real numbers). The perturbation series does not make sense. A novelty appears when one starts to compute the transition probabilities. The transition probabilities have to be computed in a nonperturbative way which, at least in simplified mathematical examples (even those looking like nonrenormalizable series), gives real values between 0 and 1 capable to represent probabilities. However these calculations should be done numerically and we have only been able to compute simplified mathematical examples due to the fact these calculations appear very demanding in the physically significant situation with an infinite dimensional Fock space and the QFT operators

Wave-type equations of low regularity

We prove local existence and uniqueness of the Cauchy problem for a large class of tensorial second order linear hyperbolic partial differential equations with coefficients of low regularity in a suitable class of generalized functions.Comment: 16 pages, 1 figur

BORELS THEOREM FOR GENERALIZED-FUNCTIONS

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THE LEVI PROBLEM IN NUCLEAR SILVA SPACES

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ON SOME SPACES OF ENTIRE-FUNCTIONS DEFINED ON INFINITE DIMENSIONAL SPACES

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EXISTENCE OF HOLOMORPHIC MAPPINGS WITH PRESCRIBED ASYMPTOTIC EXPANSIONS AT A GIVEN SET OF POINTS IN INFINITE DIMENSIONS

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CONVOLUTION EQUATIONS IN SPACES OF INFINITE DIMENSIONAL ENTIRE-FUNCTIONS

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