Speaker
Giovanni Villadoro
(Abdus Salam Int. Cent. Theor. Phys. (IT))
Description
We strengthen the cosmological bound on the axion mass, by solving the momentum-dependent Boltzmann equations for axion-pion scatterings and by using a phenomenological production rate derived from pion-pion scattering data, overcoming the breakdown of chiral perturbation theory. Using present cosmological datasets we obtain m_a < 0.24 eV. To further improve the bound and exploit the reach of upcoming cosmological surveys, reliable non-perturbative calculations above the QCD crossover are needed.
Primary author
Giovanni Villadoro
(Abdus Salam Int. Cent. Theor. Phys. (IT))
