Intuitively - why aren't black holes hot?

In summary: But if you have something that emits energy, like a regular refrigerator or a lightbulb, then its temperature will be a little higher than absolute zero because it will be emitting energy that's absorbed by the object. Additionally, Hawking showed that black holes must emit a tiny amount of radiation, which is what we call "heat." See, if you have something that... doesn't emit energy, then it will have a temperature near absolute zero because there's nothing to give off the heat. But if you have something that emits energy, like a regular refrigerator or a lightbulb, then its temperature will be a
  • #36
Chronos said:
Given that events occurring inside the event horizon are entirely unobservable, is there a point to this line of discussion?

No, it seems a bit redundant. The fascinating thing for me - related to the discussion of temperature - is what happens to the heat/energy as it is consumed into the singularity?
 
Space news on Phys.org
  • #37
enosis_ said:
No, it seems a bit redundant. The fascinating thing for me - related to the discussion of temperature - is what happens to the heat/energy as it is consumed into the singularity?

The textbook answer is that it's "simply" converted to mass. Keep in mind the singularity isn't a "thing", it's just a word to describe a place where the calculations provided by the theory no longer work.
 
  • #38
justsomeguy said:
The textbook answer is that it's "simply" converted to mass. Keep in mind the singularity isn't a "thing", it's just a word to describe a place where the calculations provided by the theory no longer work.

Perhaps the better question might be is this the original state of the converted energy - or a step closer to it?
 
  • #39
justsomeguy said:
Keep in mind the singularity isn't a "thing", it's just a word to describe a place where the calculations provided by the theory no longer work.

Any theory for gravity based on non scalar mathematics fails at the point of inflection, which is exactly why the author of relativity objected to theories referencing points within the mass radius, once you remove the mass radius from calculations you return to non scalar mathematics, a realm in which only wizards and trolls reside.

Singularities are the problems with mathematical philosophy that physics fails to notice.
 
  • #40
Mathematics is the language of physics. Yes, there are mathematical illusions and situations where our models fail to include, or, properly parameterize all of the relevant variables. But, I disagree there is anything philosphical about mathematics.
 
  • #41
Chronos said:
Mathematics is the language of physics. Yes, there are mathematical illusions and situations where our models fail to include, or, properly parameterize all of the relevant variables. But, I disagree there is anything philosphical about mathematics.

So what exactly is differentiation? or infinity? :)
What happens at points of inflection?, what does a change in sign mean?, and how does it apply to any given model?
Black hole theory is a primary candidate for study, objects accelerate to a near complete halt in a very short time below the point of inflection, which is opposite to what an object does above the point of inflection.
The change in sign has no real meaning in mathematics?
Gravitational models would still work if we ignore the maths below the point of inflection, however would they still work if we ignored the maths above the point of inflection?

Mathematics is a shorthand for ideas expressed in natural languages, the language of physics is natural language, sometimes expressed in shorthand form.
 
  • #42
codex34 said:
So what exactly is differentiation? or infinity? :)
What happens at points of inflection?, what does a change in sign mean?, and how does it apply to any given model?
Black hole theory is a primary candidate for study, objects accelerate to a near complete halt in a very short time below the point of inflection, which is opposite to what an object does above the point of inflection.
The change in sign has no real meaning in mathematics?
Gravitational models would still work if we ignore the maths below the point of inflection, however would they still work if we ignored the maths above the point of inflection?

Mathematics is a shorthand for ideas expressed in natural languages, the language of physics is natural language, sometimes expressed in shorthand form.
Differentiation is mathematically rigorous way of expressing an ordered change. The proper way to treat an event horizon is as an indefinite integral. You can't differentiate an indefinite integral in the way you are suggesting.
 
<h2>1. Why are black holes not hot?</h2><p>Black holes are not hot because they do not emit any form of radiation or heat. This is due to the fact that they have a strong gravitational pull that prevents anything, including heat, from escaping.</p><h2>2. How can black holes exist without heat?</h2><p>Black holes can exist without heat because they do not rely on heat to maintain their structure or function. Instead, they rely on the force of gravity to hold themselves together.</p><h2>3. Can black holes ever become hot?</h2><p>Black holes can become hot if they are actively consuming matter from their surroundings. This matter is accelerated and heated up as it falls towards the black hole, creating a bright and hot accretion disk around it.</p><h2>4. What happens to heat when it enters a black hole?</h2><p>When heat enters a black hole, it is absorbed and converted into mass. This is because the intense gravitational pull of the black hole warps space-time, causing heat to lose its energy and become part of the black hole's mass.</p><h2>5. Can we measure the temperature of a black hole?</h2><p>No, we cannot measure the temperature of a black hole directly. However, we can estimate the temperature of the accretion disk around a black hole by studying the radiation emitted from it. This can give us an idea of the temperature of the matter being consumed by the black hole.</p>

1. Why are black holes not hot?

Black holes are not hot because they do not emit any form of radiation or heat. This is due to the fact that they have a strong gravitational pull that prevents anything, including heat, from escaping.

2. How can black holes exist without heat?

Black holes can exist without heat because they do not rely on heat to maintain their structure or function. Instead, they rely on the force of gravity to hold themselves together.

3. Can black holes ever become hot?

Black holes can become hot if they are actively consuming matter from their surroundings. This matter is accelerated and heated up as it falls towards the black hole, creating a bright and hot accretion disk around it.

4. What happens to heat when it enters a black hole?

When heat enters a black hole, it is absorbed and converted into mass. This is because the intense gravitational pull of the black hole warps space-time, causing heat to lose its energy and become part of the black hole's mass.

5. Can we measure the temperature of a black hole?

No, we cannot measure the temperature of a black hole directly. However, we can estimate the temperature of the accretion disk around a black hole by studying the radiation emitted from it. This can give us an idea of the temperature of the matter being consumed by the black hole.

Similar threads

Replies
7
Views
733
  • Cosmology
Replies
4
Views
1K
Replies
9
Views
1K
  • Special and General Relativity
2
Replies
62
Views
3K
Replies
20
Views
2K
Replies
15
Views
2K
Replies
49
Views
4K
  • Special and General Relativity
Replies
23
Views
999
Replies
7
Views
2K
Back
Top