Seminarium Kosmologia i Fizyka Cząstek

Several notable applications of the effective action exist in particle physics and cosmology. First, I will provide an extensive introduction to the basic concepts of effective actions and spontaneous symmetry breaking. Next, I will focus on some topics that have been discussed in the literature recently. These are the resummation of the infrared contributions, issues concerning the gauge-dependence of the effective action and the interplay of these two effects.