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The study of the universe's primordial plasma at high temperature plays animportant role when tackling different questions in cosmology, such as theorigin of the matter-antimatter asymmetry. In the Minimal Standard Model (MSM)neither the amount of CP violation nor the strength of the phase transition areenough to produce and preserve baryon number during the Electroweak PhaseTransition (EWPT), which are two of the three ingredients needed to developbaryon asymmetry. In this talk we present the first part of the analysis donewithin a scenario where it is viable to have improvements to the aforementionedsituation: we work with the degrees of freedom in the broken symmetry phase ofthe MSM and analyze the development of the EWPT in the presence of a weakmagnetic field. More specifically, we calculate the particle self-energies thatinclude the effects of the weak magnetic field, needed for the MSM effectivepotential up to ring diagrams.

Minimal Standard Model self-energies at finite temperature in the presence of weak magnetic fields: towards a full symmetry restoration study