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| Paper IPM / Astronomy / 12444 |
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| We investigate the viability of the braneworld model with energy exchange between the brane and bulk by using the most recent observational data related to the background evolution. We show that this energy exchange behaves like a source of dark energy and can alter the profile of the cosmic expansion. The new supernova Type Ia (SNIa) Gold sample, Supernova Legacy Survey (SNLS) data, the position of the acoustic peak at the last scattering surface from the Wilkinson Microwave Anisotropy Probe (WMAP) observations and the baryon acoustic oscillation peak found in the Sloan Digital Sky Survey (SDSS) are used to constrain the free parameters of this model. To infer its consistency with the age of the Universe, we compare the age of old cosmological objects with that computed using the best-fitting values for the model parameters. At 68 per cent level of confidence, the combination of Gold sample SNIa, cosmic microwave background (CMB) shift parameter and SDSS data bases provides | #937;m= 0.29+0.03 | #8722;0.02, | #937;A= | #8722;0.71+0.03 | #8722;0.03 and | #956;= | #8722;0.40+0.28 | #8722;0.26, hence a spatially flat Universe with | #937;K= 0.00+0.04 | #8722;0.04. The same combination with SNLS supernova observation gives | #937;m= 0.27+0.02 | #8722;0.02, | #937;A= | #8722;0.74+0.04 | #8722;0.02 and | #956;= 0.00+0.30 | #8722;0.30 consequently provides a spatially flat Universe | #937;K= | #8722;0.01+0.04 |
#8722;0.03. These results obviously seem to be compatible with the most recent WMAP results indicating a flat Universe
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