Cosmological bounds on pseudo Nambu-Goldstone bosons

@inproceedings{Cadamuro2012CosmologicalBO,
  title={Cosmological bounds on pseudo Nambu-Goldstone bosons},
  author={Davide Cadamuro and Javier Redondo},
  year={2012}
}
We review the cosmological implications of a relic population of pseudo Nambu-Goldstone bosons (pNGB) with an anomalous coupling to two photons, often called axion-like particles (ALPs). We establish constraints on the pNGB mass and two-photon coupling by considering big bang nucleosynthesis, the physics of the cosmic microwave background, and the diffuse photon background. The bounds from WMAP7 and other large-scale-structure data on the effective number of neutrino species can be stronger… CONTINUE READING

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