Lower Spectral Branches of a Particle Coupled to a Bose Field

The structure of the lower part (i.e. $\epsilon$-away below the two-boson threshold) spectrum of Fr\"ohlich's polaron Hamiltonian in the weak coupling regime is obtained in spatial dimension $d\geq 3$. It contains a single polaron branch defined for total momentum $p\in G^{(0)}$, where $G^{(0)}\subset {\mathbb R}^d$ is a bounded domain, and, for any $p\in {\mathbb R}^d$, a manifold of polaron + one-boson states with boson momentum $q$ in a bounded domain depending on $p$. The polaron becomes unstable and dissolves into the one boson manifold at the boundary of $G^{(0)}$. The dispersion laws and generalized eigenfunctions are calculated

Wild boar helminth fauna (sus scrofa) in the subzone of oak and dark-coniferous forests of Belarus

The article presents data obtained by studying an epizootic situation of wild boars helminthosis in the subzone of oak and dark-coniferous forests of Belarus. Gelminth fauna of a wild boar is presented by 13 species from 4 classes. The most widespread wild boars gelminthosis is lung threadworm infection which contamination activators reach 98.4%