1. Classification of dark energy models
in the
Danny Marfatia
University of Kansas
with V. Barger and E. Guarnaccia (hep-ph/ )

2. Non-constant eqn. of state parameterization
Chevallier, Polarski,
Linder

3. Dark energy models
• Only classify models with exotic energy or a vacuum
contribution
• Modifications to FRW equation not considered
eg. Cardassian models not included

4. Thawing models: • models with axions, pseudo Nambu-Goldstone bosons,
moduli, dilatons

5. Cooling models: • w decreases from w > -1
• tracker models, dynamical SVSY breaking, supergravity

6. Barotropic fluids:
• Freezing models and barotropic fluids do not overlap

7. Phantom models: • w < -1
• Prototype has ghost with negative kinetic term

8. Impose above constraints at z=1:

10. Dodelson, Kinney, Kolb

11. Combined analysis of HZT and SNLS data
2 survey-dependent
nuisance parameters

12. LSS + Lyα + bias from SDSS + Gold SN1a + WMAP
Seljak et al.

13. Caution: • Classification not comprehensive • Not included
- modifications to FRW
neutrino dark energy
generalized or inhomogeneous w
• Classification provides guidance as to what kinds
of schemes preferred by data