About entropy near black hole(decrease or increases)

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In summary, the entropy of a black hole is directly proportional to the surface area of its event horizon, and as the black hole decays and its mass decreases, so does its entropy. This is due to the particles emitted during the decay, which carry away the entropy. However, it is also important to note that the black hole entropy is the maximum entropy that can be obtained by the Bekenstein bound. This leads to the question of why the black hole entropy decreases, and it is believed that this is due to the expanding space and the eventual thermal equilibrium of the universe.
  • #1
sairajagopal
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The entropy of a black hole is one fourth of the area of the event horizon, so the entropy gets smaller and smaller as the black hole decays and the event horizon area becomes smaller and smaller.
If this is true I read that the black hole entropy is also the maximal entropy that can be obtained by the Bekenstein bound.

If the black hole entropy is maximum why do it decrease?...or

black hole's entropy when it decays it is maximum?

please reply me soon...
 
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  • #2
I think it decreases because space is expanding. I black hole should be the very last thing to decay in our universe, when space is reaching a thermal equilibrium and entropy is equal everywhere.
 
  • #3
The entropy of the black hole depends on the surface area of the event horizon. The surface area of a black hole depends on it's mass. As the black hole decays it's mass goes down therefore it's surface area goes down therefore it's entropy goes down. The particles that are emitted during the decay carry away the entropy.

http://en.wikipedia.org/wiki/Black_hole#Entropy_and_thermodynamics
 

1. Does entropy increase or decrease near a black hole?

Entropy generally increases near a black hole. This is due to the fact that black holes have an extremely strong gravitational pull, which causes matter and energy to become more disordered as they approach the event horizon.

2. How does the concept of entropy apply to black holes?

Entropy is a measure of the level of disorder in a system. In the context of black holes, entropy is used to describe the level of disorder in the matter and energy that is being pulled into the black hole.

3. Can entropy be reversed near a black hole?

No, entropy cannot be reversed near a black hole. The strong gravitational pull of a black hole causes matter and energy to become more disordered, and this process cannot be reversed.

4. Is there a relationship between entropy and the size of a black hole?

Yes, there is a relationship between entropy and the size of a black hole. As the size of a black hole increases, so does its entropy. This is because larger black holes have a stronger gravitational pull, which leads to a higher level of disorder in the matter and energy around them.

5. Can entropy be used to measure the strength of a black hole's gravitational pull?

Yes, entropy can be used as a measure of the strength of a black hole's gravitational pull. The higher the entropy, the stronger the gravitational pull of the black hole, as this indicates a higher level of disorder in the matter and energy being pulled into the black hole.

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