The Genesis of Cosmological Tracker Fields

Details The Genesis of Cosmological Tracker Fields The Genesis of Cosmological Tracker Fields

2000-05-31

arxiv.org/abs/astro-ph/0005608v3

Phys.Rev. D63 (2001) 103504

Astronomy and Astrophysics

Astrophysics

8 pages, Latex file, 1 figure, comments added

Scientific paper

10.1103/PhysRevD.63.103504

The role of the quintessence field as a probable candidate for the repulsive dark energy, the conditions for tracking and the requisites for tracker fields are examined. The concept of `integrated tracking' is introduced and a new criterion for the existence of tracker potentials is derived assuming monotonic increase in the scalar energy density parameter \Omega_\phi with the evolution of the universe as suggested by the astrophysical constraints. It provides a technique to investigate generic potentials of the tracker fields. The general properties of the tracker fields are discussed and their behaviour with respect to tracking parameter \epsilon is analyzed. It is shown that the tracker fields around the limiting value \epsilon \simeq \frac 23 give the best fit with the observational constraints.

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