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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

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

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

Apparent Bolometric Magnitude m(z)

Introduction
  • Universe is in accelerating expansionRiess & Perlmutter
introduction1
Introduction
  • Universe is in accelerating expansionRiess & Perlmutter
introduction2
Introduction
  • Universe is in accelerating expansionRiess & Perlmutter
introduction3
Introduction
  • Universe is in accelerating expansionRiess & Perlmutter
introduction4
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 …
introduction5
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?
properties of degenerate neutrino
Properties of degenerate neutrino
  • Decouple at early time
  • Energy density proportional to degeneracy parameter
  • It may have mass
evolution of density parameters
Evolution of density parameters
  • Hubble equation
  • Distance modulus
evolution of density parameters1
Evolution of density parameters
  • (0.1, 0.9), (0.3, 0.7), (0.5, 0.7), LCDM
possibility as a dark energy
Possibility as a dark energy
  • Light mass : do not generate structure
  • May dominate energy density with degeneracy
  • Evolution may different from standard cosmology
possibility as a dark energy1
Possibility as a dark energy
  • It is not possible to explain with standard consideration
  • Need to study carefully Boltzmann equation
remarks
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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