Do the black holes have infinite mass ?

In summary, black holes do not have infinite mass or infinite density. While there may be a singularity at their center, it is not a physically infinitesimal point and the mass is smeared out over a non-zero volume. Therefore, it is not possible for the entire universe to be orbiting a black hole and losing energy at a constant rate. The concept of singularities is still not fully understood and is currently a topic of ongoing research.
  • #1
kapoor_kapoor
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Do the black holes have infinite mass? If no then how can they have infinite density? Can we suppose that all the universe is orbiting a black hole (as heaviest masses bend the space time most) and loosing energy at some rate ?
 
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  • #2
kapoor_kapoor said:
Do the black holes have infinite mass?

No.

kapoor_kapoor said:
If no then how can they have infinite density?
Who says they do? In some sense, the mass would all be concentrated at ##r = 0##, but within the event horizon, the radial coordinate is time-like so it does not really correspond to a distance inside the black hole. Outside of ##r = 0##, the Schwarzschild black hole corresponds to a vacuum solution to the Einstein field equations.

kapoor_kapoor said:
Can we suppose that all the universe is orbiting a black hole (as heaviest masses bend the space time most) and loosing energy at some rate ?
No. This is not how the Universe works.
 
  • #3
kapoor_kapoor said:
Do the black holes have infinite mass?
No, and a quick google search would have given the same answer.
kapoor_kapoor said:
If no then how can they have infinite density?
If there is a singularity in the center as general relativity predicts, it has zero volume but a finite mass.
kapoor_kapoor said:
Can we suppose that all the universe is orbiting a black hole (as heaviest masses bend the space time most) and loosing energy at some rate ?
No we cannot, that does not make sense.
 
  • #4
It is generally believe that singularities never actually occur in nature although they pop up all the time in mathematical equations used to describe physical laws. For example the electric field of an electron is expressed by [tex]
latex.png
[/tex] where R is the distance from the electron. The catch here is the electron is not a physically infinitesimal point, by the laws of quantum physics, it is smeared out over a finite volume of space so the distance 'R' can never actually be zero. Something very similar probably also applies to a black hole singularity. The finite mass of a black hole is smeared out over a phyically non-zero volume of space. Hence the density is never actually infinite in physical reality.. We cannot currently quantify the true volume of a black hole singularity. For more extensive discussion see http://www.askamathematician.com/2012/09/q-what-are-singularities-do-they-exist-in-nature/
 
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Related to Do the black holes have infinite mass ?

1. What is a black hole?

A black hole is a region in space with a gravitational pull so strong that nothing, including light, can escape from it. It is created when a massive star collapses in on itself.

2. How is the mass of a black hole measured?

The mass of a black hole is typically measured by observing the effects of its gravity on surrounding objects, such as stars or gas clouds. Scientists can also measure the rotation speed of material orbiting the black hole to determine its mass.

3. Can a black hole have infinite mass?

No, a black hole cannot have infinite mass. While a black hole's mass is incredibly large and concentrated, it is still a finite amount. It is often referred to as a singularity, where the laws of physics break down.

4. Do all black holes have the same mass?

No, the mass of a black hole can vary greatly. Smaller black holes can have masses equivalent to a few times that of our sun, while supermassive black holes at the center of galaxies can have masses equivalent to billions of suns.

5. What happens if a black hole's mass increases?

If a black hole's mass increases, its gravitational pull will also increase. This can cause it to swallow up nearby matter and potentially grow larger. However, there is a limit to how much a black hole can grow before it reaches its maximum size.

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