How and why could an interacting system of many particles be described as if all particles
were independent and identically distributed? This question is at least as old as statistical …

We study quantum particles in interaction with a force-carrying field, in the quasi-classical
limit. This limit is characterized by the field having a very large number of excitations (it is …

We study the ground state energy and ground states of systems coupling nonrelativistic
quantum particles and force-carrying Bose fields, such as radiation, in the quasiclassical …

The purpose of this article is twofold. On one hand, we rigorously derive the Newton--
Maxwell equation in the Coulomb gauge from first principles of quantum electrodynamics in …

We consider a non-relativistic electron bound by an external potential and coupled to the
quantized electromagnetic field in the standard model of non-relativistic QED. We compute …

A spin (qubit) is in contact with a bosonic reservoir. The state of the reservoir contains a
parameter {\varepsilon} interpolating between quantum and classical reservoir features. We …

We consider the Nelson model with ultraviolet cutoff, which describes the interaction
between non-relativistic particles and a positive or zero mass quantized scalar field. We take …

We study the dynamics of the three-dimensional polaron---a quantum particle coupled to
bosonic fields---in the quasi-classical regime. In this case, the fields are very intense and the …

We study the regularity properties of fermionic equilibrium states at finite positive
temperature and show that they satisfy certain semiclassical bounds. As a corollary, we …

In this paper we study the semiclassical behavior of quantum states acting on the C*-algebra
of canonical commutation relations, from a general perspective. The aim is to provide a …