Dark photons and the cosmic radiation background

PIRSA ID: 21040016
Série : Particle Physics
Event Type: Seminar
Domaine(s) scientifique(s) :
Particle Physics
Date de fin :
  • Hongwan Liu, Massachusetts Institute of Technology (MIT) - Center for Theoretical Physics

The dark photon is a well-motivated extension of the Standard Model which can mix with the regular photon. This mixing is enhanced whenever the dark photon mass matches the primordial plasma frequency, leading to resonant conversions between photons and dark photons. These conversions can produce observable cosmological signatures, including distortions to the cosmic radiation background. In this talk, I will discuss a new analytic formalism for these conversions that can account for the inhomogeneous distribution of matter in our universe, leading to new and revised limits on the mixing parameter of light dark photons derived from the COBE/FIRAS measurement of the cosmic microwave background spectrum. I will then describe some ongoing work on a dark sector model that can explain the longstanding ARCADE radio background excess through resonant conversions of dark photons.