Semiclassical treatment of a k-essence effect on cosmic temperature
- 作者: Bandyopadhyay A.1, Gangopadhyay D.1, Moulik A.1
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隶属关系:
- Department of Physics
- 期: 卷 23, 编号 2 (2017)
- 页面: 184-194
- 栏目: Article
- URL: https://journals.rcsi.science/0202-2893/article/view/176080
- DOI: https://doi.org/10.1134/S0202289317020037
- ID: 176080
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详细
A phenomenological model with quantum fluctuations of matter fields is described for the Cosmic Microwave Background (CMB) radiation evolution in the presence of dark energy in the form of a k-essence scalar field ϕ(t). Our model is realized through a time-dependent oscillator Lagrangian. Here ϕ couples to the scale factor a(t). Themodel gives: (a) the observed variation of a with time and (b) the observed value of the epoch when the universe passed over from decelerated to accelerated phase. These two features have been matched with graphical transcriptions of SNe Ia data. Further, the evolution is sensitive to the presence of an inhomogeneity. Its sensitivity increases as one goes further into the past. The value of the inhomogeneity parameter determines the transition epoch from decelerated to accelerated phase. A positive value of the inhomogeneity parameter leads an earlier transition, and its negative value to a later one. A slightly negative value of the inhomogeneity parameter gives a better agreement with the observed value for the transition time. The formalism also accommodates dark matter in the form of non-relativistic dust without any change in the above scenarios.
作者简介
Abhijit Bandyopadhyay
Department of Physics
编辑信件的主要联系方式.
Email: abhijit@rkmvu.ac.in
印度, Belur Math, Howrah, 711202
Debashis Gangopadhyay
Department of Physics
Email: abhijit@rkmvu.ac.in
印度, Belur Math, Howrah, 711202
Arka Moulik
Department of Physics
Email: abhijit@rkmvu.ac.in
印度, Belur Math, Howrah, 711202