The Black Hole in a Spatially Compact Spacetime

In summary, a black hole in a spatially compact spacetime is a region of space where the gravitational pull is so strong that nothing, including light, can escape from it. As a result, the black hole appears as a dark void in the fabric of space. The size and density of a black hole are determined by the amount of mass it contains, with larger black holes having a stronger gravitational pull. The theory of general relativity, developed by Albert Einstein, explains the formation and behavior of black holes in spacetime. The study of black holes continues to be a fascinating and complex subject in the field of astrophysics.
  • #1
Perspicacious
76
0
The last paragraph of http://arxiv.org/PS_cache/physics/pdf/0006/0006039.pdf states this conclusion:

Thus in Friedmann–Lemaıtre universes, (i) the expansion of the universe and (ii) the existence of a non–trivial topology for the constant time hypersurfaces both break the Poincare invariance and single out the same “privileged” inertial observer who will age more quickly than any other twin: the one comoving with the cosmic fluid – although aging more quickly than all her traveling sisters may be not a real privilege!
See these references also:

http://physics.ucr.edu/Active/Abs/abstract-13-NOV-97.html
http://www.everythingimportant.org/viewtopic.php?t=79
http://cornell.mirror.aps.org/abstract/PRD/v8/i6/p1662_1
http://arxiv.org/PS_cache/gr-qc/pdf/0101/0101014.pdf
http://arxiv.org/PS_cache/gr-qc/pdf/0503/0503070.pdf
http://www.everythingimportant.org/viewtopic.php?t=605
http://www.everythingimportant.org/relativity/simultaneity.htm

I'm delighted that common sense is finally being recognized in the physics community. When do you think it will be realized that an absolute time order precludes the possibility of anything falling into a black hole?
 
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  • #2
Note that local invariance is intact - it is only global invariance that's at issue.
 
  • #3
I'll make this a question

How are you going to evade the equation for proper time in a gravitational field being directly comparable with the topologically distinguished, universally applicable background time that characterizes spatially compact spacetime? Take the spacetime cylinder for example. All observers agree on the simultaneity of events. Clock rates everywhere, in this instance, are all physically tied together. Why should a global sense to the order of all spacetime events for all observers miraculously disappear in a spatially compact universe if we were to add the extremely faint gravitational field of an electron to it? Let the radius of the electron shrink to zero. At what step in the limiting process does the universally agreed upon cosmic everywhere present "now" suddenly disappear?
 

1. What is a black hole in a spatially compact spacetime?

A black hole in a spatially compact spacetime is a region in space where the gravitational pull is so strong that nothing, including light, can escape. It is formed when a massive star dies and its core collapses in on itself, creating a singularity with infinite density and zero volume.

2. How is a spatially compact spacetime different from a regular black hole?

A spatially compact spacetime refers to a black hole that exists in a closed or finite universe, meaning that it is bound by a finite space and does not extend infinitely. This is different from a regular black hole, which is typically described in an infinite or unbounded universe.

3. Can a black hole in a spatially compact spacetime be observed?

No, a black hole in a spatially compact spacetime cannot be directly observed. However, its effects on surrounding matter and light can be observed and studied, providing evidence of its existence.

4. How does the size of a black hole in a spatially compact spacetime affect its properties?

The size of a black hole in a spatially compact spacetime is directly related to its mass. The more massive the black hole, the stronger its gravitational pull and the larger its event horizon (the point of no return for matter and light).

5. Can a black hole in a spatially compact spacetime ever disappear?

No, once a black hole is formed, it will continue to exist indefinitely. However, it can lose mass through Hawking radiation, a process where the black hole emits energy and particles, eventually causing it to evaporate. This process is extremely slow, so it is unlikely that we will ever witness the disappearance of a black hole in a spatially compact spacetime.

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