What is ergosphere of black hole?

The ergosphere is a region located outside a rotating black hole’s outer event horizon. The ergosphere touches the event horizon at the poles of a rotating black hole and extends to a greater radius at the equator.

What happens inside the ergosphere?

Frame dragging creates a cosmic whirlpool known as the ergosphere, which occurs outside a rotating black hole’s outer event horizon. Any object within the ergosphere is forced to move in the same direction in which the black hole is spinning. In this manner, black holes can have powerful effects on their surroundings.

What is a rotating black hole called?

Charged Black Hole can be of two types. A charged, non-rotating black hole is known as a Reissner-Nordstrom black hole, a charged, rotating black hole is called a Kerr-Newman black hole.

What is J in Kerr metric?

Kerr–Newman. where Q represents the body’s electric charge and J represents its spin angular momentum. According to the Kerr metric, a rotating body should exhibit frame-dragging (also known as Lense–Thirring precession), a distinctive prediction of general relativity.

Where does the ergosphere get its name from?

Cartesian Kerr–Schild coordinates, equatorial perspective. The ergosphere is a region located outside a rotating black hole ‘s outer event horizon. Its name was proposed by Remo Ruffini and John Archibald Wheeler during the Les Houches lectures in 1971 and is derived from the Greek word ἔργον ( ergon ), which means “work”.

Is the ergosphere outside the event horizon?

Since the ergosphere is outside the event horizon, it is still possible for objects that enter that region with sufficient velocity to escape from the gravitational pull of the black hole.

What is the shape of the ergosphere in a black hole?

The ergosphere touches the event horizon at the poles of a rotating black hole and extends to a greater radius at the equator. A black hole with modest angular momentum has an ergosphere with a shape approximated by an oblate spheroid, while faster spins produce a more pumpkin-shaped ergosphere.

How is the speed of light defines the ergosphere?

It is the speed of light that arbitrarily defines the ergosphere surface. Such a surface would appear as an oblate that is coincident with the event horizon at the pole of rotation, but at a greater distance from the event horizon at the equator. Outside this surface, space is still dragged, but at a lesser rate.