Orateur
Subodh Patil
Description
CMB anisotropies probe primordial gravitational wave backgrounds of frequencies between 10^{-18} and 10^{-15} Hz. Pulsar timing arrays begin to be sensitive to backgrounds starting in the nano-hertz regime, seemingly leaving an approximately six decade gap in frequency coverage. This talk will discuss how spectral distortions of the CMB covers this gap in a meaningful way, and discuss various phenomenological consequences for a variety of beyond the standard model scenarios, including low scale (dark sector) phase transitions, cosmic strings and ultra-light axions.
