We review results concerning the critical behavior of spin systems at equilibrium. We
consider the Ising and the general O (N)-symmetric universality classes, including the N→ 0 …

The asymptotic safety scenario in quantum gravity is reviewed, according to which a
renormalizable quantum theory of the gravitational field is feasible which reconciles …

The description of solids at a microscopic level is complex, involving the interaction of a
huge number of its constituents, such as ions or electrons. It is impossible to solve the …

A bstract This work employs the spectral reconstruction approach of ref.[1] to determine an
inclusive rate in the 1+ 1 dimensional O (3) non-linear σ-model, analogous to the QCD part …

We review results concerning the θ dependence of 4D SU (N) gauge theories and QCD,
where θ is the coefficient of the CP-violating topological term in the Lagrangian. In particular …

The asymptotic safety scenario in quantum gravity is reviewed, according to which a
renormalizable quantum theory of the gravitational field is feasible which reconciles …

Using results from conformal field theory, we compute several universal amplitude ratios for
the two-dimensional Ising model at criticality on a symmetric torus. These include the …

These lectures provide a simple introduction to non perturbative methods of field theory in
1+ 1 dimensions, and their application to the study of strongly correlated condensed matter …

We consider the finite-temperature frequency and momentum-dependent two-point functions
of local operators in integrable quantum field theories. We focus on the case where the zero …

We review applications of the sine-Gordon model, the O (3) non-linear sigma model, the U
(1) Thirring model, and the O (N) Gross–Neveu model to quasi one-dimensional quantum …