Prof. Naresh Dadhich

The ultimate end state of gravitational collapse signifying the limiting compactness would be reached when all matter fields involving the equations of state and degeneracies have been won over, and the distribution consists of free elements interacting only through gravity -- a Virial distribution. It is then left for motion to fend for itself against gravitational pull. The relativistic Virial theorem prescribes that there could exist only two equilibrium states, one for massive particles when gravitational energy is half of the mass, defining a Buchdahl star, and the other for massless photons, when gravitational energy is equal to the mass, defining a black hole with a horizon. So the question, whether black hole or Buchdahl star?