publication . Article . Other literature type . Preprint . 2018

Room for New Physics in the Rayleigh-Jeans Tail of the Cosmic Microwave Background

Pospelov, Maxim; Pradler, Josef; Ruderman, Joshua T.; Urbano, Alfredo;
Open Access English
  • Published: 20 Jul 2018
  • Publisher: APS
We show that despite stringent constraints on the shape of the main part of the CMB spectrum, there is considerable room for its modification within its Rayleigh-Jeans (RJ) end, $\omega \ll T_{\rm CMB}$. We construct explicit New Physics models that give an order one (or larger) increase of photon count in the RJ tail, which can be tested by existing and upcoming experiments aiming to detect the cosmological 21 cm emission/absorption signal. This class of models stipulates the decay of unstable particles to dark photons, $A'$, that have a small mass, $m_{A'} \sim 10^{-14} - 10^{-9}$ eV, non-vanishing mixing angle $\epsilon$ with electromagnetism, and energies mu...
arXiv: Astrophysics::Cosmology and Extragalactic Astrophysics
free text keywords: astro-ph.CO, Astrophysics and Astronomy, hep-ph, Particle Physics - Phenomenology, High Energy Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics
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