Variable Chaplygin gas: constraints from supernovae, GRB and gravitational wave merger events

• Published in: Astrophysics and space science 2023-07, Vol.368 (7), p.54, Article 54
• Main Authors: Chraya, Ashley, Muralichandran, Yuvraj, Sethi, Geetanjali
• Format: Article
• Language: English
• Subjects: Astrobiology; Astronomy; Astrophysics; Astrophysics and Astroparticles; Chaplygin gas; Constraint modelling; Cosmology; Dark energy; Dark matter; Gamma ray bursts; Gamma rays; Gravitational waves; Markov chains; Monte Carlo simulation; Observations and Techniques; Physics; Physics and Astronomy; Platinum; Quintessence (cosmology); Radiation; Science education; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics; Supernovae; Universe
• ISSN: 0004-640X; 1572-946X
• DOI: 10.1007/s10509-023-04211-4

We investigate the cosmological constraints on the Variable Chaplygin gas model from the latest observational data: SCP Union 2.1 compilation dataset of Type Ia supernovae (SNe Ia), Pantheon sample of SNe Ia, Platinum Sample of Gamma Ray Bursts (GRB), and GWTC-3 of gravitational wave merger events. Variable Chaplygin gas is a model of interacting dark matter and dark energy, which interpolates from a dust-dominated era to a quintessence-dominated era. The Variable Chaplygin gas model is shown to be compatible with Type Ia Supernovae and gravitational merger data. We have obtained tighter constraints on cosmological parameters B s and n using the Pantheon sample. Using the Markov chain Monte Carlo (MCMC) method on the Pantheon sample, we obtain B s = 0.108 ± 0.034 , n = 1.157 ± 0.513 and H 0 = 70.020 ± 0.407 . For GRBs, we get B s = 0.20 ± 0.11 , n = 1.45 ± 1.40 and H 0 = 70.41 ± 0.67 , and on GWTC-3, we obtain B s = 0.130 ± 0.076 , n = 0.897 ± 1.182 and H 0 = 69.838 ± 3.007 . The combined constraints from the above data sets are B s = 0.11 ± 0.03 , n = 1.14 ± 0.36 and H 0 = 70.34 ± 0.61 .