Quote:
Originally Posted by Jeff
Interesting discussion.
Info on the following site is a bit of a mixed bag, but some of the questions are valid and much of it is thought provoking.
http://www.topology.org/sci/grav.html
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I had a look at this website and after the first couple lines I found a problem...
The author claims that BH were never observed..
OK... That may be so (indeed, they were never DIRECTLTY observed)
However, couple of stars near the centre of our own Milky Way WERE observed, orbiting something invisible, in very very close orbit (100 AU or so), which has a mass of couple of millions of suns.
There must be an explanation for this.
Perhaps it is not a BH.. but the mass estimation is certainly pretty correct.. and size is smaller-than-something... and it is a monster of an object. So what is it ????
Another problematic claim on that website:
"The upper limit on the strength of gravity implies that Einstein's general relativity equations will have to be corrected so that gravitational field strength can never exceed a fixed upper limit. This is analogous to requiring that nothing can go faster than the speed of light. Trying to extrapolate the success of general relativity from its successes under low field strength conditions to very high field strengths is analogous to extending Newton's and Maxwell's equations to motion at and beyond the speed of light."
This is simply not the case.
What is really implied here is non-linearity of space-time continuum. However, speed f light is finite and of certain value not because of non-linearity but because of exactly the opposite. Also because of the mechanism of EM wave propagation in space, and that is described by Maxwell's equations.
I am still reading this website... so there will be more comments from me, hopefully :-)