Authors: Karan R.Takkhi
The Hubble diagram continues to remain one of the most important graphical representations in the realm of astronomy and cosmology right from its genesis that depicts the velocity-distance relation for the receding large-scale structures within the observable Universe; it is the diagram that helps us to understand the expansion of the Universe. In this paper I introduce the molecular expansion model in order to explain the expansion of the Universe. The molecular expansion model considers the distribution of large-scale structures as molecules inside a vacuum chamber. Since large-scale structures are ensemble of atoms, therefore, they can be treated as molecules possessing finite amount of energy. Instead of considering that space is expanding, the paper emphasizes upon the actual recession of large-scale structures. The study conducted in this paper finds the recessional behaviour of large-scale structures to be consistent with the recessional behaviour of molecules. Redshift-distance relation has been plotted for 580 Type Ia supernovae from the Supernova Cosmology Project, and, the reason for the deviation of the Hubble diagram from exhibiting a linear redshift-distance relation for the structures belonging to the remote Universe has been explained by introducing the concept of “acceleration phase”. This concept further explains the reason for the observed accelerating expansion of the Universe. It is suggested through this concept that accelerating structures belonging to the remote Universe will attain a constant recessional velocity in future.
Comments: 15 pages, 6 tables, 6 graphs, 1 figure
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