Finding eV-scale light relics with cosmological observables

@article{DePorzio2020FindingEL,
  title={Finding eV-scale light relics with cosmological observables},
  author={Nicholas DePorzio and Weishuang Linda Xu and Julian B. Mu{\~n}oz and Cora Dvorkin},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
  year={2020}
}
Cosmological data provide a powerful tool in the search for physics beyond the Standard Model (SM). An interesting target are light relics, new degrees of freedom which decoupled from the SM while relativistic. Nearly massless relics contribute to the radiation energy budget, and are commonly searched through variations in the effective number $N_{\rm eff}$ of neutrino species. Additionally, relics with masses on the eV scale (meV-10 eV) become non-relativistic before today, and thus behave as… 
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