We investigate the stability of the pion string in a thermal bath and a dense medium. We find
that stability is dependent on the order of the chiral transition. String core stability within the …

By using the symmetry improved Cornwall-Jackiw-Tomboulis effective formalism, we study a
pion string of the O (4) linear sigma model at finite temperature in chiral limit. In terms of the …

We quantify the baryon anti-baryon production generated by a metastable cosmic string,
similar to the embedded pion string. More precisely, we study skyrmion production mediated …

The aim of this thesis is to study the effects of fluctuation and dissipation dynamics in Early
Universe cosmology. The formal description of the Early Universe relies on cosmological …