Solutions of the classical φ-theory in Minkowski space-time are analyzed in a perturbation expansion in the nonlinearity. Using the language of Feynman diagrams, the solution of the Cauchy problem is expressed in terms of tree diagrams which involve the retarded Green’s function and have one outgoing leg. In order to obtain general tree diagrams, we set up a “classical measurement process” in w...

We test the Sinc function representation, a novel method for numerically evaluating Feynman diagrams, by using it to evaluate the three-loop master diagrams. Analytical results have been obtained for all these diagrams, and we find excellent agreement between our calculations and the exact values. The Sinc function representation converges rapidly, and it is straightforward to obtain accuracies...

UML activity diagrams can be used for modeling the dynamic aspects of systems and for constructing executable systems through forward and reverse engineering. They are very suitable for describing the model of program behaviour. In this paper, we extend UML activity diagrams by introducing timing constraints so that they can be used to model real-time software systems, and give the solution for...

We show that the equivalence theorem approximating one-loop gauge sector diagrams by including only Goldstone bosons in the loop gives a remarkably poor approximation to the amplitude for the decay H → γγ and for the process γγ → HH. At one loop, large logarithms can arise that evade power counting arguments.

in recent decades, due to the complexity of the environment, interorganizational collaboration has become the major source of competitive advantage for firms. researches suggested that many of these partnership structures will meet failure in long term. accordingly, this study based on system dynamics method was investigated the critical success factors of strategic alliances in the ceramics an...