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Cosmic Neutrino Background

Cosmic Neutrino Background. Zong-Kuan Guo NCU, Taiwan, March 30, 2013. particles:. h istory of the relic neutrinos. ~0.3MeV. ~0.1MeV. ~1eV. ~1MeV. n eutrino decoupling. e  e  annihilation. photon decoupling. structure formation. BBN. the weak reaction rate:.

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Cosmic Neutrino Background

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  1. Cosmic Neutrino Background Zong-KuanGuo NCU, Taiwan, March 30, 2013

  2. particles: history of the relic neutrinos ~0.3MeV ~0.1MeV ~1eV ~1MeV neutrino decoupling ee annihilation photon decoupling structure formation BBN the weak reaction rate: the expansion rate of the Universe: neutrino decoupling:

  3.  temperature:  number density per flavor:  energy density:

  4. neutrino oscillation parameters:

  5. neutrino properties • neutrino masses (massless, light or heavy?) • the effective number of neutrino species (sterile?) • the chemical potential (lepton asymmetry?) • Lorentz invariance violation • stability, non-standard decoupling, … cosmological observations • big-bang nucleosynthesis • cosmic microwave background anisotropies • large scale structure distribution

  6. neutrino masses  CMB: the early ISW effect  LSS: velocity dispersion

  7. eCMB: SPT2011+ACT2011 highL: ACT2013 + SPT2012 WP: WMAP9 polarization

  8. neutrino species  CMB: radiation density, the early ISW effect, anisotropic stress, enhanced damping tail  BBN: an additional radiation energy density

  9. chemical potential  BBN: extra radiation energy density It shifts the equilibrium proton-to-neutron ratio

  10. Lorentz invariance violation the deformed dispersion relation  CMB: the Boltzmann equation in the synchronous gauge

  11.  BBN: the energy density the weak reaction rate in the Lorentz-violating extension of the Standard Model (D.Colladay, A.Kostelecky arXiv:hep-ph/9809521) data:

  12. ZKG, QGH, RGC and YZZ, arXiv:1206.5588 ZKG and JWH, arXiv:1303.2813

  13. Thanks!

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