Phantom Energy

Zong-Kuan Guo(advisor: Yuan-Zhong Zhang)

Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100080, P.R.China

List of Publication(2004)

1. Inflationary Attractor in Braneworld Scenario , Phys.Rev. D69 (2004) 063502.

2. Cosmological Scaling Solutions of Multiple Tachyon Fields with Inverse Square Potentials , JCAP 0408 (2004) 010.

3. On the Dynamical Stability of Phantom Cosmology, Phys.Lett. B594 (2004) 247.

4. Cosmological Evolution of a Quintom Model of Dark Energy, (2004) Submitted to PLB.

5. Interacting Phantom Energy , (2004) Submitted to PRD.

6. Cosmological Evolution of Interacting Phantom Energy, (2004) In preparation.

Outline

ObservationsAttractor Behavior of Phantom FieldPhantom and QuintessenceInteracting Phantom EnergyConclusions

Observations

• WMAP(2003)

• Type Ia Supernovae

the High-Z Supernova Team (Riess et al. 1998)

the Supernova Cosmology Project (Perlmutter et al. 1999)

78.0

04.073.0

w

N.Arkani-Hamed, L.J.Hall, C.Kolda and H.Murayama, astro-ph/0005111

U.Alam, V.Sahni, T.D.Saini and A.A.Starobinsky

astro-ph/0311364

D.Huterer and A.Cooray, astro-ph/0404062

Attractor Behavior of Phantom Field

Z.K.Guo, Y.S.Piao and Y.Z.Zhang, astro-ph/0404225

0)(3

)]([3

221

22

VH

VH

)(2/

)(2/2

2

V

Vpw

2/m )( V 2

eVV 0)(

)]/Cos([1 V )( V 0 f

Phantom and Quintessence

Z.K.Guo, Y.S.Piao, X.Zhang and Y.Z.Zhang, astro-ph/0410654

0)(3

0)(

3

0)(

3

mmm PHd

dVH

d

dVH

])()([3

2212

21

22

VVH

2/m )( V 2

2/2/),( 2222 mmV

2222

00),(

eVeVV

Interacting Phantom Energy

Z.K.Guo, Y.S.Piao, X.Zhang and Y.Z.Zhang, astro-ph/0410654

)()(3

)()(32

2

pmmmm

pmppp

HcPH

HcPH

)(3

22

pmH

2.0,2.0, 2p cr

p

m

2.0,4.1, 2p cr

p

m

Conclusions

Attractor behaviorEquation of state parameterCoincidence problemBig rip