By means of finite-temperature, many-body perturbation theory we derive through order e4 the corrections to an ideal Fermi gas plus an ideal Maxwell–Boltzmann gas of ions. This computation is carried out for general values of the de Broglie density. In a previous paper we carried out this...

The concept of the central charge in a two-dimensional conformally invariant critical system is discussed. It is shown how this concept is related to a hyperuniversal amplitude ratio. In turn we illustrate the computation of its value by means of high-temperature series expansions for the cases...