Constraints over Cosmological Constant and Quintessence Fields in an Accelerating Universe

Details Constraints over Cosmological Constant and Quintessence Fields in an Accelerating Universe Constraints over Cosmological Constant and Quintessence Fields in an Accelerating Universe

2000-07-06

arxiv.org/abs/astro-ph/0007079v2

Astronomy and Astrophysics

Astrophysics

12 pages, Latex file, 4 figures, typos corrected

Scientific paper

A brief account of the current cosmological observations is given and their implications for QCDM and $\Lambda$CDM cosmologies are discussed. The nucleosynthesis and the galaxy formation constraints have been used to put limits on $\Omega_\phi$ during cosmic evolution, and develop a realistic approach to the tracking behaviour of quintessence fields. The astrophysical constraints are applied to interpolate the value of the tracking parameter $\epsilon \simeq 0.75$ at the present epoch and also to find the lower and the upper limits for $\Lambda$ in the accelerating universe. It is shown that the transition from deceleration to acceleration in the cosmic expansion occurs earlier in $\Lambda$CDM cosmology compared to QCDM cosmology.

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