A SAHA
Articles written in Pramana – Journal of Physics
Volume 89 Issue 2 August 2017 Article ID 0029 Research Article
Observational constraints on extended Chaplygin gas cosmologies
We investigate cosmological models with extended Chaplygin gas (ECG) as a candidate for dark energy and determine the equation of state parameters using observed data namely, observed Hubble data, baryon acousticoscillation data and cosmic microwave background shift data. Cosmological models are investigated considering cosmic fluid which is an extension of Chaplygin gas, however, it reduces to modified Chaplygin gas (MCG) andalso to generalized Chaplygin gas (GCG) in special cases. It is found that in the case of MCG and GCG, the best-fit values of all the parameters are positive. The distance modulus agrees quite well with the experimental Union2data. The speed of sound obtained in the model is small, necessary for structure formation. We also determine the observational constraints on the constants of the ECG equation.
Volume 96 All articles Published: 29 June 2022 Article ID 0127 Research Article
Anisotropic compact star in modified Vaidya–Tikekar model admitting new solutions and maximum mass
K B GOSWAMI A SAHA P K CHATTOPADHYAY
In this paper, we try to demonstrate a method to generate new class of exact solutions to the Einstein’s field equations (EFE) by introducing
a new parameter (
Volume 97 All articles Published: 20 December 2022 Article ID 0010 Research Article
Effect of charge on the maximum mass of the anisotropic strange quark star
A SAHA K B GOSWAMI B DAS P K CHATTOPADHYAY
In this article, we have studied the solutions of Einstein–Maxwell field equations for compact objects in the presence of net electric charge. Interior physical 3-space is defined by
Vaidya–Tikekar metric in spheroidal geometry. The metric is characterised by two parameters, namely, spheroidal parameter
Volume 97, 2023
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