Speaker
Michele Cicoli
Description
I will discuss the role that ultralight axions can play in string cosmology. These particles emerge very naturally in string compactifications where the effective field theory is under control and can behave as dark radiation, early dark energy, dark matter or quintessence-like dark energy. Moreover, they can produce detectable CMB birefringence signals. At the end of the talk I will also describe the activities of the newly born COST action COSMIC WISPers in the Dark Universe: Theory, astrophysics and experiments.
Primary author
Michele Cicoli
