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But why does surface area of an Event Horizon increase?

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But why does surface area of an Event Horizon increase?

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martinbn

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That's a theorem (proven by Hawking). Are you asking about the proof of the theorem?

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mathman

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Surface area depends on radius. Radius is proportional to mass.

But why does surface area of an Event Horizon increase?

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But why does surface area of an Event Horizon increase?

It increases due to the black hole pulling more material into itself, therefore trapping it in the event horizon, enlarging it. The material would get trapped into an 'orbit' around the black hole. Never able to escape, neither get pulled into the black hole.

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Drakkith

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Nugatory

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The surface area of a black hole is given by ##4\pi{R}^2## where ##R## is the Schwarzschild radius. The schwarzschild radius increases as mass falls into the black hole, so the area also does.But why does surface area of an Event Horizon increase?

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Nugatory

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yes.It increases due to the black hole pulling more material into itself

That's not right. The trapped material falls through the event horizon and into the central singularity rather quickly; it's just that an observer outside the event horizon doesn't get to see it.therefore trapping it in the event horizon, enlarging it. The material would get trapped into an 'orbit' around the black hole. Never able to escape, neither get pulled into the black hole.

This question has been the subject of many threads over in the relativity forum, so you may want to try searching the topic there.

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