IPM Calendar 
Thursday 28 March 2024   Today  
Events for day: Monday 11 July 2022    
           11:00 - 12:00     Journal Club: Experiment & Phenomenology - google meet
Cosmic Birefringence from Monodromic Axion Dark Energy

School
PARTICLES AND ACCELERATORS

Abstract:

The recently reported non-zero isotropic birefringence angle in Planck 2018 polarization data provides a tantalizing hint for new physics of axions. In this paper, we explain this by a string theory motivated axion with a monodromy potential that plays the role of dark energy. Upon using the birefringence measurement and the constraint on the equation of state for dark energy in this scenario, we find an upper bound on the axion decay constant as fa . 1016 GeV. This naturally gives an energy scale of order GUT and can resolve the theoretical issue of super-Planckian field range of the conventional axion dark energy mo ...