Speaker
Massimiliano Lattanzi
(Universita di Ferrara)
Description
Axions can be produced in the early Universe through thermal
or nonthermal processes. In the former case, they contribute
to the cosmological energy budget as a hot dark matter
component, while in the latter they could be the cold dark
matter component. Moreover, if the breaking of the
Peccei-Quinn symmetry happens during inflation, quantum
fluctuations in the axion field will give rise to
isocurvature perturbations. In my talk I will present
constraints that can be put on axion properties from
cosmological observations, mainly focusing on measurements
of the anisotropies of the cosmic microwave background from
the Planck satellite. I will also comment on the effect of
theoretical uncertainties on estimates of axion parameters.
Primary author
Massimiliano Lattanzi
(Universita di Ferrara)
