Kinematic Constraints to the Transition Redshift from SNe Ia Union Data
| dc.creator | Cunha, J. V. | |
| dc.date | 2008-11-14 | |
| dc.date.accessioned | 2026-07-07T12:51:22Z | |
| dc.date.available | 2026-07-07T12:51:22Z | |
| dc.description | The kinematic approach to cosmological tests provides a direct evidence to the present accelerating stage of the universe which does not depend on the validity of general relativity, as well as on the matter-energy content of the Universe. In this context, we consider here a linear two-parameter expansion for the decelerating parameter, $q(z)=q_0+q_1z$, where $q_0$ and $q_1$ are arbitrary constants to be constrained by the Union supernovae data. By assuming a flat Universe we find that the best fit to the pair of free parameters is ($q_0,q_1$) = ($-0.73,1.5)$ whereas the transition redshift is $z_t = 0.49^{+0.14}_{-0.07}$ ($1σ$) $^{+0.54}_{-0.12}$ ($2σ$). This kinematic result is in agreement with some independent analyzes and accommodates more easily many dynamical flat models (like $Λ$CDM). | |
| dc.description | 10 pages, 4 figures, 1 table | |
| dc.identifier | https://arxiv.org/abs/0811.2379 | |
| dc.identifier | http://arxiv.org/abs/0811.2379 | |
| dc.identifier | Phys.Rev.D79:047301,2009 | |
| dc.identifier | doi:10.1103/PhysRevD.79.047301 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/222969 | |
| dc.subject | Astrophysics | |
| dc.title | Kinematic Constraints to the Transition Redshift from SNe Ia Union Data | |
| dc.type | text |