Evaporating black holes, a kind of flux of space?

[Spinnor]

If a black hole can "evaporate" via Hawking radiation then there is a radial flux of energy from the black hole? Put a box around on such evaporating black hole. When the black hole is gone there is less space in the box? If so is that space carried away by the Hawking particles?

Thanks for any help!

 

[Chalnoth]

If a black hole can "evaporate" via Hawking radiation then there is a radial flux of energy from the black hole? Put a box around on such evaporating black hole. When the black hole is gone there is less space in the box? If so is that space carried away by the Hawking particles?

Thanks for any help!

I assume you're talking about a perfectly transparent box, just a hypothetical region around the black hole? I don't really know how you would go about making any sort of statement about how much space there is within the box in the first place.

 

[Spinnor]

I assume you're talking about a perfectly transparent box, just a hypothetical region around the black hole? I don't really know how you would go about making any sort of statement about how much space there is within the box in the first place.

I thought General Relativity allowed us to measure volumes of regions with and without mass inside? The ratio the the radius to the circumference of some region gives a measure of the mass inside that region? A region with more mass has a greater volume then the same region with no mass?

Thanks for your time!

 

[Chalnoth]

I thought General Relativity allowed us to measure volumes of regions with and without mass inside?

No, General Relativity really doesn't talk about volumes directly.

Perhaps you were thinking about an entire universe? If we take a universe with a black hole and a positive cosmological constant, that universe has a future horizon. Anything that happens beyond this horizon "now" will never reach us (a global now is a bit arbitrary, but if we say that "now" is the time at which different places see the same CMB temperature we currently see, we can talk sensibly about it). Similarly, anything we release now (whether light rays or something else) will never reach anything that lies beyond that horizon.

After the black hole evaporates and the radiation all redshifts away, the horizon is larger than it was with the black hole there.

 

[sardar]

I can provide some insights into the concept of evaporating black holes and their relationship to space. First of all, it is important to clarify that black holes do not actually "evaporate" in the traditional sense of the word. Instead, they emit radiation through a process called Hawking radiation, which causes them to gradually lose mass over time.

This radiation is indeed a flux of energy and particles from the black hole, as you have correctly pointed out. However, it is important to note that this flux does not necessarily result in a decrease in the amount of space in the surrounding area. This is because the energy and particles emitted by the black hole are still contained within the same space, albeit in a different form.

In other words, the space inside the "box" remains the same even as the black hole emits Hawking radiation. This is because, according to the laws of physics, energy and matter cannot be created or destroyed, only transformed into different forms. So while the black hole may lose mass, the energy and particles it emits are still present in the same space.

Furthermore, it is also worth noting that the concept of space itself is a complex and debated topic in physics. Some theories suggest that space is a constantly expanding and dynamic entity, while others propose that it is made up of discrete units or "quanta". Therefore, it is difficult to say whether the space "carried away" by Hawking particles is actually "less" space or simply transformed in some way.

In conclusion, the idea of evaporating black holes and their relationship to space is a fascinating and ongoing area of research in physics. While it may seem like a simple concept, it raises many complex questions and challenges our understanding of the fundamental nature of the universe.