- 61 Views
- Uploaded on
- Presentation posted in: General

Degenerate neutrino as a Dark Energy

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

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

- Introduction
- Properties of degenerate neutrino
- Evolution of density parameters
- Possibility as a dark energy
- Remarks

- Apparent Bolometric Magnitude m(z)

- Universe is in accelerating expansionRiess & Perlmutter

- Universe is in accelerating expansionRiess & Perlmutter

- Universe is in accelerating expansionRiess & Perlmutter

- Universe is in accelerating expansionRiess & Perlmutter

- 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 …

- 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?

- Decouple at early time
- Energy density proportional to degeneracy parameter
- It may have mass

- Hubble equation
- Distance modulus

- (0.1, 0.9), (0.3, 0.7), (0.5, 0.7), LCDM

- Light mass : do not generate structure
- May dominate energy density with degeneracy
- Evolution may different from standard cosmology

- It is not possible to explain with standard consideration
- Need to study carefully Boltzmann equation

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