Schwarzschild solution as a result of thermodynamics
  We obtain the Schwarzschild solution from thermodynamic considerations using
the assumptions of a quasi local mass form (the Misner-Sharp mass) and
geometric surface gravity in a spherically symmetric spacetime. The deduction
is extended to other cases such as the de Sitter, anti-de Sitter,
Reissner-Nordstr\"om and higher dimensional spacetimes. This paper demonstrates
the simple hypotheses to obtain these known spherically symmetric solutions via
thermodynamics, where essentially the Misner-Sharp mass is the mass for an
adiabatic system.
