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Dissipative CDM model with causal sign-switching bulk viscous pressure
Vishnu A Pai, Sarath N, Titus K Mathew
Extending the standard CDM model by considering dissipative effects within a causal viscous framework, and obtaining an analytical solution for the Hubble parameter remains a ch…
Observational Evidence to Logistic Dark Energy Driving the Accelerating Universe
Sarath Nelleri, Gopi Krishna, Navaneeth Poonthottathil
We present logistic dark energy model (LDEM), where the dark energy density follows a logistic function for the scale factor. The equation of state parameter of dark energy ()…
Comprehensive Study of -essence Model: Dynamical System Analysis and Observational Constraints from Latest Type Ia Supernova and BAO Observations
Saddam Hussain, Sarath Nelleri, Kaushik Bhattacharya
We constrain the parameters of the -essence scalar field model with inverse square and exponential potentials using data sets including Pantheon+SHOES and the Dark Energy Survey…
Scalar Field Dominated Cosmology with Woods-Saxon Like Potential
Sreerag Radhakrishnan, Sarath Nelleri, Navaneeth Poonthottathil
Dark energy can be characterized by a canonical scalar field, known as quintessence. Quintessence allows for a dynamical equation of state . A previous st…
Observational evidence for parametrized emergent dark energy models
Sarath Nelleri, Navaneeth Poonthottathil
Recent cosmological observations show a statistically significant tension in the estimated values of the cosmological parameters within the standard CDM framework. In a recent s…