2 problems

The Bose polaron considered by Lampart is defined with an ultraviolet cutoff, and the method developed in this paper is an ultraviolet renormalisation procedure for constructing a…

The paper considers a Bose gas with an impurity, whose effective mean-field Hamiltonian is denoted by $\mathbb{H}^{\mathrm{F}}$. For contact interactions, let … where $n_0$ is the…