Quantum mechanics is our most successful physical theory. However, it raises conceptual
issues that have perplexed physicists and philosophers of science for decades. This 2004 …

For any given algebra of local observables in Minkowski space an associated scaling
algebra is constructed on which renormalization group (scaling) transformations act in a …

These notes essentially reproduce lectures given at the International School for Advanced
Studies (Trieste) and at the Scuola Normale Superiore (Pisa) on various occasions. The …

Quantum Field Theory (QFT) has proved to be the most useful strategy for the description of
elementary particle interactions and as such is regarded as a fundamental part of modern …

In this paper we study the generalized electrodynamics contribution to the electron-positron
scattering process e-e+→ e-e+, ie, Bhabha scattering. Within the framework of the standard …

Quantum field theory (QFT) is widely viewed as one of the most successful theories in
science—it has predicted phenomena before they were observed in nature 2, and its …

This book reflects our own struggle to understand the semiclassical behaviour of quantized
fields in the presence of boundaries. Along many years, motivated by the problems of …

We present a complete study of a family of tachyonic scalar fields living on the de Sitter
universe. We show that for an infinite set of discrete values of the negative squared mass …

We present the quantum Yang-Mills theory in the four-dimensional de Sitter ambient space
formalism. In accordance with the SU (3) gauge symmetry the interaction Lagrangian is …

A bstract Being interested in the compatibility of Asymptotic Safety with Hilbert space
positivity (unitarity), we consider a local truncation of the functional RG flow which describes …