6 papers
Subtleties in non-equilibrium horizon thermodynamics of modified gravity theories
Vishnu A Pai, Vishnu S Namboothiri, Titus K Mathew
Thermodynamic interpretations of gravity often arise from applying the Clausius relation to spacetime horizons. In modified gravity theories with higher-order equations of motion,…
Cosmology with non-linear barotropic Israel-Stewart fluid with causal relaxation time
Vishnu A Pai, Titus K Mathew
We derive an extended expression for the relaxation time of a barotropic Israel-Stewart (IS) fluid using the non-linear causality constraint, and propose a new formulation for mode…
vCF: Extending CDM into a Unified Model with Particle Creation
Vishnu A Pai, Titus K Mathew
We present a novel extended version of the CDM model that provides analytical solution for Hubble parameter uniting all epochs of cosmic evolution starting from inflation to lat…
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…
Bulk viscous late acceleration under near equilibrium conditions in f(R, T) gravity with mixed matter
Vishnu A Pai, Titus K Mathew
Various studies have shown that the late acceleration of the universe can be caused by the bulk viscosity associated with dark matter. But recently, it was indicated that a cosmolo…
Near Equilibrium Constraints on Bulk Viscous Models in Gravity
Vishnu A Pai, Titus K Mathew
Recent studies indicate that, near equilibrium condition could not be maintained for bulk viscous matter models during the accelerated expansion of the universe in the context of E…