The Black Hole in a Spatially Compact Spacetime

Click For Summary
SUMMARY

The discussion centers on the implications of Friedmann–Lemaître universes regarding the expansion of the universe and the existence of non-trivial topologies, which disrupt Poincaré invariance and identify a privileged inertial observer. This observer, comoving with the cosmic fluid, ages more quickly than others, raising questions about the nature of time and simultaneity in spatially compact spacetimes. The conversation highlights the tension between local and global invariance, particularly in relation to gravitational fields and the concept of absolute time order in black hole scenarios.

PREREQUISITES
  • Understanding of Friedmann–Lemaître cosmology
  • Familiarity with Poincaré invariance in physics
  • Knowledge of proper time equations in gravitational fields
  • Concepts of spatially compact spacetimes and their topological implications
NEXT STEPS
  • Research the implications of Poincaré invariance in cosmological models
  • Study the effects of gravitational fields on proper time in general relativity
  • Explore the concept of simultaneity in spatially compact spacetimes
  • Investigate the relationship between cosmic fluid dynamics and inertial observers
USEFUL FOR

Physicists, cosmologists, and students of general relativity interested in the interplay between time, topology, and gravitational effects in the universe.

Perspicacious
Messages
76
Reaction score
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?
 
Last edited by a moderator:
Physics news on Phys.org
Note that local invariance is intact - it is only global invariance that's at issue.
 
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?
 

Similar threads

  • · Replies 8 ·
Replies
8
Views
1K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 58 ·
2
Replies
58
Views
7K
  • · Replies 43 ·
2
Replies
43
Views
6K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 10 ·
Replies
10
Views
4K
  • · Replies 134 ·
5
Replies
134
Views
12K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 19 ·
Replies
19
Views
3K
  • · Replies 7 ·
Replies
7
Views
5K