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yicong2011
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What is Expanding Horizon of a black hole?
Recently, I want to read something general on Expanding Horizon...
Recently, I want to read something general on Expanding Horizon...
George Jones said:See sections 5.1.7, 5.1.8, and 5.4.1 from Poisson's notes,
http://www.physics.uoguelph.ca/poisson/research/agr.pdf,
which evolved into the excellent book, A Relativist's Toolkit: The Mathematics of black hole Mechanics.
PAllen said:Imagine at some future time, a small chunk of matter will fall into the black hole. However small, and however far in the future, there is some point sufficiently close the apparent horizon that whether its outgoing light ever makes it to the 'distance' depends on that matter falling in, in the future.
yuiop said:Hi PAllen,
I was hoping to catch you while you were still online so I have not had time to read the linked material posted by George. Could you elaborate a bit more on the above quoted text and what exactly you mean by the "distance"?
The Expanding Horizon of a black hole refers to the boundary or point of no return around a black hole, where the gravitational pull is so strong that nothing, not even light, can escape. This boundary is also known as the event horizon.
The Expanding Horizon of a black hole is formed when a massive star collapses under its own gravity. As the star collapses, it becomes infinitely dense and all its mass is concentrated into a single point, known as the singularity. The event horizon is formed around this singularity.
At the Expanding Horizon of a black hole, the gravitational pull is so strong that it warps the fabric of space and time. This means that time and space are distorted, and objects passing through the event horizon will appear to slow down and eventually cease to exist. Anything that crosses the event horizon is pulled into the black hole and cannot escape.
Yes, the Expanding Horizon of a black hole will continue to grow over time. As matter falls into the black hole, it adds to its mass and increases the size of the event horizon. However, the rate of expansion is limited by the speed of light, so it does not expand infinitely fast.
No, once an object crosses the Expanding Horizon of a black hole, it cannot escape. This is because the escape velocity at the event horizon is greater than the speed of light. Therefore, not even light can escape from the black hole, which is why it appears completely black to outside observers.