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Cosmological evolution of a tachyon-quintom model of dark energy

Shang-Gang Shia, Yun-Song Piaoa and and Cong-Feng Qiaoa,b

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In this work we study the cosmological evolution of a dark energy model with two scalar fields, i.e. the tachyon and the phantom tachyon. This model enables the equation of state w to change from w > −1 to w < −1 in the evolution of the universe. The phase-space analysis for such a system with inverse square potentials shows that there exists a unique stable critical point, which has power-law solution. In this paper, we also study another form of tachyon-quintom model with two fields, which involves the interactions between both fields.

Keywords

dark energy experiments

dark energy theory

 

E-print Number: 0812.4022

Cited: by |

Refers: to

PACS

98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)

95.30.Tg Thermodynamic processes, conduction, convection, equations of state

14.80.-j Other particles (including hypothetical)

95.36.+x Dark energy

Subjects

Gravitation and cosmology

Particle physics and field theory

Astrophysics and astroparticles

Dates

Issue 04 (April 2009)

Received 6 March 2009, accepted for publication 10 April 2009

Published 27 April 2009



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