Black holes -- Can you chill the particles of a black hole?

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Discussion Overview

The discussion revolves around the theoretical possibility of chilling the particles associated with a black hole, particularly focusing on the implications of such an action and the nature of black holes themselves. The scope includes conceptual exploration and theoretical implications related to black hole physics.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether it is theoretically possible to chill the particles of a black hole and what the consequences would be.
  • Another participant asserts that a black hole is a vacuum and has no particles, implying that the original question may be based on a misunderstanding of black hole properties.
  • A later reply discusses Hawking radiation, suggesting that while particles emitted from a black hole can be cooled after emission, there is no direct control over their temperature at the point of emission.
  • This reply also notes that the temperature of Hawking radiation is inversely related to the size of the black hole, indicating that making a black hole larger could theoretically lower its temperature.
  • It is mentioned that classical black holes are considered to have no temperature or can be viewed as being at absolute zero.

Areas of Agreement / Disagreement

Participants express differing views on the nature of black holes and the feasibility of chilling particles associated with them. There is no consensus on the original question, and the discussion remains unresolved regarding the implications of cooling particles related to black holes.

Contextual Notes

The discussion includes assumptions about the nature of black holes, particularly regarding the existence of particles and the implications of Hawking radiation. There are unresolved aspects related to the definitions of temperature in the context of black holes.

caybrax
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TL;DR
I have a strange question on my mind
I want to ask if you can theoretically chill the particles of a black hole and if it is possible to achieve it what will happen
 
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caybrax said:
Summary:: I have a strange question on my mind

I want to ask if you can theoretically chill the particles of a black hole and if it is possible to achieve it what will happen
A black hole is a vacuum. It has no particles.
 
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i feel strange
 
Moderator's note: Thread level changed to "I".
 
berkeman said:
Are you a quark?

He is "A PF Quark", as every newbie in this forum! 🤣
 
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lomidrevo said:
He is "A PF Quark", as every newbie in this forum! 🤣
Better to be a quark than a quack.
 
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You can chill the particles (Hawking radiation) emitted by a quantum black hole, since after they are emitted, they are no longer in the black hole. However, you do not have any direct control of the temperature of particles emitted by a black hole. The temperature of particles emitted by a black hole is given by the Bekenstein-Hawking formulas (see Eq 1.1 in https://arxiv.org/abs/1410.1486).

The bigger a black hole is, the lower the temperature of its Hawking radiation.
https://phys.org/news/2016-09-cold-black-holes.html

So indirectly, you can lower the temperature of a black hole by making it bigger. You can make a black hole bigger by throwing stuff into it.

A classical black hole has no temperature (or can be said to be at absolute zero), and no Hawking radiation.
 
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