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Some LRS Bianchi type II string-dust cosmological models with time decaying vacuum energy Λ


Citation

Amirhashchi, Hassan and Dehzangi, Arash (2010) Some LRS Bianchi type II string-dust cosmological models with time decaying vacuum energy Λ. In: Regional Annual Fundamental Science Symposium 2010 (RAFSS 2010), 8-9 June 2010, Grand Season Hotel, Kuala Lumpur. (pp. 139-148).

Abstract / Synopsis

A new class of LRS Bianchi type II string- dust cosmological models are obtained in which the expansion (ᶿ) in the model is assumed to be proportional to the shear (σ). To get the deterministic models of the universe we consider the case of Reddy string (ρ + λ = 0), where ρ and λ are the rest energy density and the tension density of the string cloud, respectively. It is shown that in all models the vacuum energy density Λ is a positive and decreasing function of time and it approaches a small positive value at late times which is supported by recent results from the observations of (SN Ia). The physical and geometrical behaviour of these models are discussed.


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Additional Metadata

Item Type: Conference or Workshop Item (Paper)
Divisions: Faculty of Science
Publisher: Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia
Keywords: Bianchi type II; Reddy string; Cosmological constant
Depositing User: Nabilah Mustapa
Date Deposited: 03 Sep 2018 12:10
Last Modified: 03 Sep 2018 12:10
URI: http://psasir.upm.edu.my/id/eprint/64968
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