Degenerate neutrino as a dark energy
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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

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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