A Two-Field Dilaton Model of Dark Energy

doi:10.1088/0256-307X/26/6/069501

Chin. Phys. Lett.

2009, Vol. 26

Issue (6): 069501 DOI: 10.1088/0256-307X/26/6/069501

GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS

A Two-Field Dilaton Model of Dark Energy

LIANG Nan¹, GAO Chang-Jun², ZHANG Shuang-Nan ^1,3

¹Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 100084²National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012³Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, PO Box 918-3, Beijing 100049

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LIANG Nan, GAO Chang-Jun, ZHANG Shuang-Nan 2009 Chin. Phys. Lett. 26 069501

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Abstract We investigate the cosmological evolution of a two-field model of dark energy, where one is a dilaton field with canonical kinetic energy and the other is a phantom field with a negative kinetic energy term. Phase-plane analysis shows that the ``phantom''-dominated scaling solution is the stable late-time attractor of this type of model. We find that during the evolution of the universe, the equation of state w changes from w > -1 to w <-1, which is consistent with recent observations.

Keywords: 95.36.+x 98.80.-k 98.80.Es

Received: 10 September 2008 Published: 01 June 2009

PACS:	95.36.+x	(Dark energy)
	98.80.-k	(Cosmology)
	98.80.Es	(Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc))

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