Seminarium "Teoria cząstek elementarnych i kosmologia"

I will summarize our recent effective quantum field theory computations of the free energy of a gas of spin-1/2 fermions interacting through a short-range spin-independent repulsive potential. The result is used to study the impact that higher-order corrections can have on the characteristics of a phase transition to the ordered phase, namely on the emergence of itinerant ferromagnetism. I will also comment on the relation of our computations to experimental searches for the ferromagnetic transition in cold gases of fermionic atoms.