Tolman–Oppenheimer–Volkoff equation

The Tolman–Oppenheimer–Volkoff (TOV) equation is a key result in general relativity that describes the structure of a spherically symmetric, non-rotating star in hydrostatic equilibrium, particularly those composed of nuclear matter, such as neutron stars. It extends the concepts of hydrostatic equilibrium in a gravitational field, taking into account the effects of general relativity.