Variable Chaplygin gas: Constraining parameters using FRBs

Geetanjali Sethi, Udish Sharma, Nadia Makhijani

Astrophysics and Space Science(2024)

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摘要
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± 0.10 , n=1.10± 1.15 and H_0 = 70.46± 0.66 with the SNe Ia data set, B_s = 0.09± 0.06 , n= 0.44± 0.89 and H_0=70.57± 0.64 with the FRB data set, B_s = 0.16± 0.11 , n=1.06± 1.25 and H_0 = 70.37± 0.65 with the BAO data set, B_s = 0.05± 0.000 , n=1.46± 0.23 and H_0 = 70.21± 0.57 with the H(z) data set and B_s = 0.20± 0.11 , n=1.25± 1.17 and H_0 = 70.37± 0.64 with the GRB data set. A good agreement for H_0 is observed from these data sets.
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关键词
Variable Chaplygin Gas,Fast radio bursts,SNe Ia,Cosmology
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