Black hole surface gravity


The surface gravity, g, of an astronomical or other object is the gravitational acceleration experienced at its surface. The surface gravity may be thought of as the acceleration due to gravity experienced by a hypothetical test particle which is very close to the object’s surface and which, in order not to disturb the system, has negligible mass. black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. A black hole is a region of spacetime from which nothing escapes. Around a black hole there is a mathematically defined surface called an event horizon that marks the point of no return. It is called “black” because it absorbs all the light that hits the horizon, reflecting nothing, making it almost an ideal black body. black holes have a non-zero temperature and emit radiation with a nearly perfect black-body spectrum, ultimately evaporating.The mechanism for this emission is related to vacuum fluctuations in which a virtual pair of particles is separated by the gravity of the hole, one member being sucked into the hole, and the other being emitted. Black hole surface gravity at the horizon is depended on its mass and its Schwarzschild (gravitational) radius.

Related formulas


gBBlack hole surface gravity (m/s2)
GNewtonian constant of gravitation
MThe mass of the black hole (kg)
rsSchwarzschild (gravitational) radius (m)