Abstract
We investigate cosmological constraints on the Variable Chaplygin gas model parameters with latest observational data of the Fast Radio Bursts and compare the results with previous constraints obtained using SNe Ia (Pantheon+SHOES), Gamma Ray Bursts, Baryon Acoustic Oscillations and Hubble parameter observational data. The Variable Chaplygin gas model is shown to be compatible with these datasets. We have obtained tighter constraints on model parameters \(B_{s}\) and \(n\), using the FRB data set. By using the Markov chain Monte Carlo (MCMC) method we obtain, \(B_{s}\)=\(0.18\pm 0.10\), \(n=1.10\pm 1.15\) and \(H_{0}\)= \(70.46\pm 0.66\) with the SNe Ia data set, \(B_{s}\)= \(0.09\pm 0.06\), \(n= 0.44\pm 0.89 \) and \(H_{0}=70.57\pm 0.64 \) with the FRB data set, \(B_{s}\)=\(0.16\pm 0.11\), \(n=1.06\pm 1.25\) and \(H_{0}\)= \(70.37\pm 0.65\) with the BAO data set, \(B_{s}\)=\(0.05\pm 0.000\), \(n=1.46\pm 0.23\) and \(H_{0}\)= \(70.21\pm 0.57\) with the H(z) data set and \(B_{s}\)=\(0.20\pm 0.11\), \(n=1.25\pm 1.17\) and \(H_{0}\)= \(70.37\pm 0.64\) with the GRB data set. A good agreement for \(H_{0}\) is observed from these data sets.
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Data Availability
No datasets were generated or analysed during the current study.
Notes
We have used the fact that for a flat Universe, \(\Omega _{b0}+\Omega _{r0}+\Omega _{ch0}=1\), i.e the total matter density sums up to unity.
References
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Acknowledgements
The authors are grateful to the Principal, St. Stephen’s College for his support and encouragement towards this research. We also thank Dr. Akshay Rana, St. Stephen’s College and Ashley Chraya, Vanderbilt University for their inputs and suggestions. We are also grateful to the reviewers for their suggestions and inputs.
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Appendix: Stability analysis
Appendix: Stability analysis
Derivations for equations (56) and (57)
Here t is the cosmic time. We can write
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Sethi, G., Sharma, U. & Makhijani, N. Variable Chaplygin gas: Constraining parameters using FRBs. Astrophys Space Sci 369, 42 (2024). https://doi.org/10.1007/s10509-024-04306-6
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DOI: https://doi.org/10.1007/s10509-024-04306-6