Constraints over Cosmological Constant and Quintessence Fields in an Accelerating Universe
| dc.creator | Johri, Vinod B. | |
| dc.date | 2000-07-06 | |
| dc.date | 2001-05-17 | |
| dc.date.accessioned | 2026-07-07T01:54:17Z | |
| dc.date.available | 2026-07-07T01:54:17Z | |
| dc.description | A brief account of the current cosmological observations is given and their implications for QCDM and $Λ$CDM cosmologies are discussed. The nucleosynthesis and the galaxy formation constraints have been used to put limits on $Ω_ϕ$ 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 $ε\simeq 0.75$ at the present epoch and also to find the lower and the upper limits for $Λ$ in the accelerating universe. It is shown that the transition from deceleration to acceleration in the cosmic expansion occurs earlier in $Λ$CDM cosmology compared to QCDM cosmology. | |
| dc.description | 12 pages, Latex file, 4 figures, typos corrected | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0007079 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0007079 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/1287 | |
| dc.subject | Astrophysics | |
| dc.title | Constraints over Cosmological Constant and Quintessence Fields in an Accelerating Universe | |
| dc.type | text |