2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47167We analyse the finite temperature phase transition of scalar QED in euclidean spacetime. Analytical solutions of approximations to a Wilsonian renormalisation group equation are discussed. Special emphasis is put on the discussion of the $3d$ running of the Abelian charge and its effects on thermodynamical quantities. An upper bound for the range of first-order phase transitions is given. Our results are compared to those of resummed perturbation theory.Talk given at the conf. Strong and Electroweak Matter '97, Eger, Hungary, 21-25 May 1997, to be published in the proceedings, 6 pages, 4 ps figuresHigh Energy Physics - Phenomenologytext