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Supernova Cosmology in an Inhomogeneous Universe
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science. (Cosmology, Particle Astrophysics and String Theory (CoPS))
2010 (English)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
Abstract [en]

The propagation of light beams originating from synthetic ‘Type Ia’ supernovae, through an inhomogeneous universe with simplified dynamics, is simulated using a Monte-Carlo Ray-Tracing method. The accumulated statistical (redshift-magnitude) distribution for these synthetic supernovae observations, which is illustrated in the form of a Hubble diagram, produces a luminosity profile similar to the form predicted for a Dark-Energy dominated universe. Further, the amount of mimicked Dark-Energy is found to increase along with the variance in the matter distribution in the universe, converging at a value of ΩX ≈ 0.7.

It can be thus postulated that at least under the assumption of simplified dynamics, it is possible to replicate the observed supernovae data in a universe with inhomogeneous matter distribution. This also implies that it is demonstrably not possible to make a direct correspondence between the observed luminosity and redshift with the distance of a cosmological source and the expansion rate of the universe, respectively, at a particular epoch in an inhomogeneous universe. Such a correspondences feigns an apparent variation in dynamics, which creates the illusion of Dark-Energy.

Place, publisher, year, edition, pages
2010. , 83 p.
Keyword [en]
Inhomogeneous Cosmology, Supernovae, Type Ia Supernova, Dark Energy, Accelerated Expansion, Accelerated Universe, Inhomogeneous Universe, Monte Carlo, Ray Tracing
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-42162OAI: diva2:346329
2010-04-23, A5:1041, Albanova University Center, Stockholm, 10:30 (English)
Physics, Chemistry, Mathematics
Available from: 2010-08-31 Created: 2010-08-18 Last updated: 2010-09-06Bibliographically approved

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Gupta, Rahul
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