4 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 la…
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 c…