cmb constraints on lorentz violation in the neutrino sector
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CMB constraints on Lorentz violation in the neutrino sector . Zong-Kuan Guo ( ITP, CAS). Weihai August 13, 2012. outline. motivations deformed dispersion relation Boltzmann equation cosmological constraints remarks. This talk is based on

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cmb constraints on lorentz violation in the neutrino sector

CMB constraints on Lorentz violation in the neutrino sector

Zong-KuanGuo (ITP, CAS)

Weihai

August 13, 2012

outline
outline
  • motivations
  • deformed dispersion relation
  • Boltzmann equation
  • cosmological constraints
  • remarks

This talk is based on

ZKG, Q-G Huang, R-G Cai, Y-Z Zhang, PRD in press [arXiv:1206.5588]

slide3

motivations

  • neutrino oscillations
  • neutrinos influence the CMB (massive or massless)
  • neutrinos influence the LSS
slide4

the deformed dispersion relation

  • the scalar perturbations of the FLRW metric in the synchronous gauge
slide5

the action in the first-order formalism

  • the Lagrangianin the synchronous gauge
slide6

the number density, energy density and pressure

  • the perturbed energy density, pressure, energy flux and shear stress
slide11

remarks

  • Compared to particle physics experiments, cosmological observations yield much weaker constraints on the Lorentz-violation parameter in the neutrino sector.
  • We neglects neutrino oscillations, possible species dependence, anisotropies associated with violations of rotation symmetry, and CPT violation.
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