Quasi-spherical solution with heat flux and non-adiabatic collapse of radiating star

摘要

The Einstein field equations are solved in ( n+ 2) dimensional Szekeres' space - time model with matter content as shear free isotropic fluid undergoing radial heat flow. It is noted that heat flow is possible only in the radial direction. Then a model is proposed for a collapsing quasi- spherical radiating star. For the description of the radiation of the system, plane symmetric Vaidya solution is considered. Both physical conditions and thermodynamical relations are studied using local conservation of momentum and surface red- shift. It is found that for the existence of radiation on the boundary, pressure ( on the boundary) is not necessary.