K. Pohlmeyer

TL;DR: In this article, the relativistic field theories in one time and one space dimension with interactions that are entirely due to quadratic constraints are shown to be closely related to integrable Hamiltonian systems.

TL;DR: In this article, the vacuum expectation value of the time-ordered product of two exponentials of free fields is defined as a distribution using minimal singularity as a criterion, and the implication of this definition for an exponentially self-coupled scalar field is studied in second order of a perturbation expansion.

TL;DR: In this paper, the expectation values of the commutator (Ω|[A (x),A(y)]|Ω) vanish in space-like direction like exp {− const|(x-y2|α/2#x007D; with α>1 for sufficiently many vectors Ω, it follows thatA(x) is a local field.

TL;DR: In this paper, the derivative coupling of massless pseudoscalar neutral particles with a charged spinor field in two-dimensional space-time is reduced to a self-interacting spinor and a free pseudo-calar field.

TL;DR: The truncated Wightman functions cannot decrease arbitrarily fast for large space-like separation of the arguments as discussed by the authors, and for certain configurations they can fall off at most exponentially, in the sense that the number of arguments can be arbitrarily fast.