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Light WIMPs, Equivalent Neutrinos, BBN, and the CMB · Around

2014

Light WIMPs, Equivalent Neutrinos, BBN, and the CMB

Steigman, Gary, Nollett, Kenneth M.

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Recent updates to the observational determinations of the primordial abundances of helium and deuterium are compared to the predictions of BBN to infer the universal ratio of baryons to photons (or, the present Universe baryon mass density parameter Omega_B h^2), as well as to constrain the effective number of neutrinos (N_eff) and the number of equivalent neutrinos (Delta N_nu).

These BBN results are compared to those derived independently from the Planck CMB data.
In the absence of a light WIMP (chi), N_eff = 3.05(1 + Delta N_nu/3).
In this case, there is excellent agreement between BBN and the CMB, but the joint fit finds that Delta N_nu = 0.40 +/- 0.17, disfavoring standard big bang nucleosynthesis (SBBN: Delta N_nu = 0) at 2.4 sigma, as well as a sterile neutrino (Delta N_nu = 1) at 3.5 sigma.

Built on

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Then

Izotov, Y. I. Stasinska, G., & Guseva, N. G. 2013, A&A, 558, A57
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Later among the works it cites.
Nollett, K. N. & Steigman, G. 2013, arXiv:1312.5725 [astro-ph.CO]
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Planck Collaboration, arXiv:1303.5076 [astro-ph.CO]
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Steigman, G. 2013, Phys. Rev. D, 87, 103517
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