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Degenerate neutrino as a Dark Energy

Degenerate neutrino as a Dark Energy. 12 th Marcel Grossmann Meeting, 12-18 July 2009, Paris Hyung Won Lee, Inje University July 15, 2009 Collaboration with K.Y. Kim, R. Ruffini. Contents. Introduction Properties of degenerate neutrino Evolution of density parameters

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Degenerate neutrino as a Dark Energy

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  1. Degenerate neutrino as a Dark Energy 12th Marcel Grossmann Meeting, 12-18 July 2009, Paris Hyung Won Lee, Inje University July 15, 2009 Collaboration with K.Y. Kim, R. Ruffini

  2. Contents • Introduction • Properties of degenerate neutrino • Evolution of density parameters • Possibility as a dark energy • Remarks

  3. Apparent Bolometric Magnitude m(z) Introduction • Universe is in accelerating expansionRiess & Perlmutter

  4. Introduction • Universe is in accelerating expansionRiess & Perlmutter

  5. Introduction • Universe is in accelerating expansionRiess & Perlmutter

  6. Introduction • Universe is in accelerating expansionRiess & Perlmutter

  7. Introduction • The present Universe • accelerated expansion supernova type Ia (SN Ia) data EOS (equation of state) • Main issue of the present cosmology : How to explain the present accelerating universe?negative pressure : Dark Energy candidate: cosmological constant , quintessence , k- essence , holographic dark energy , phantom matter , MaVaN …

  8. Introduction • All candidates have weakness • No physical explanation is given • Can we explain dark energy or accelerating expansion with some physical principle? • Can we explain accelerating expansion with neutrinos?

  9. Properties of degenerate neutrino • Decouple at early time • Energy density proportional to degeneracy parameter • It may have mass

  10. Evolution of density parameters • Hubble equation • Distance modulus

  11. Evolution of density parameters • (0.1, 0.9), (0.3, 0.7), (0.5, 0.7), LCDM

  12. Possibility as a dark energy • Light mass : do not generate structure • May dominate energy density with degeneracy • Evolution may different from standard cosmology

  13. Possibility as a dark energy • It is not possible to explain with standard consideration • Need to study carefully Boltzmann equation

  14. Remarks • It seems not possible as a dark energy except mass varying with scalar field coupling • Cosmological integration of kinematic equation

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