Shear-free models for relativistic fluids with heat flow and pressure isotropy.

摘要: We model the interior dynamics of a relativistic radiating fluid in nonstatic spherically symmetric spacetime. The matter distribution takes form an imperfect with nonvanishing radially directed heat flux. pressure is isotropic and spacetime manifold described by shear-free line element. In our investigation, isotropy consistency condition which realises second order nonlinear ordinary differential equation variable coefficients gravitational potentials. examine this governing imposing various forms for these potentials review classes physically acceptable models that are applicable astrophysics. Several new exact solutions to also found. A comparison earlier well known results undertaken. physical analysis two performed where spatial temporal evolution variables probed. demonstrate pressure, energy density flux regular behaved both throughout interior, indicate one consistent established core-envelope framework compact stellar scenarios. analyse conditions behaviour, only dominant being violated. Finally, thermodynamics undertaken Israel-Stewart theory temperature profiles noncausal causal cases presented.