Re: ALERT - Serious Problem with Canon Rebates - dpreview

Robert Coe wrote:
On Sat, 22 Nov 2008 12:07:40 -0500, Alan Browne
<alan.browne@xxxxxxxxxxxxxxxxxxxxx> wrote:
: Robert Coe wrote:
: > On Sat, 22 Nov 2008 11:01:43 -0500, Alan Browne
: > <alan.browne@xxxxxxxxxxxxxxxxxxxxx> wrote:

: > : Per Hawking there is a probability that when a particle crosses the EH : > : its virtual particle may escape (or, the virtual particle falls and the : > : particle may escape).
: > : > Hawking is wrong. He also accepts both the Big Bang and black holes, two
: > theories that can't both be correct.
: : Balderdash. They are in no way mutually exclusive. Black holes are : observed to exist.

Well ... Their predicted effects have been observed. One of the important
characteristics of black holes is that they can't be observed (at least not by
any definition of "observed" that makes sense in a photography newsgroup).

Splitting hairs. Where the effects (such as groups of suns whipping around a very small volume in space at significant fractions of the speed of light at the perigee of their orbit) is observed (as an example) the existence of black holed is more than confirmed.

: The BB is all but certain given the state of the universe today.

Oh, the BB happened all right; I don't think anybody disputes that anymore.
That it actually represents the *origin* of the universe is a lot less clear,
especially if you're not very careful with your definition of the word
"universe". And the proposition that all matter was once concentrated at a
single point and then exploded flatly contradicts black hole theory.

Where did I state it was the origin of this universe? There area variety of theories as to what was before (or beside) this edition of the universe.

And no, BB does not (and cannot) contradict the existence of BH's. 1) There is a significant difference in the amount of energy of 'all' the matter of the universe compacted to a point v. the comparatively insignificant mass of a BH and 2) the laws of physics that define a BH in the universe as it stands did not exist when the universe was at T0.


: What is less certain is whether the u continues to expand or whether
: there will be a big crunch. Thus the dark matter issue.

Dark matter is more problematic than the Big Bang. I believe it's there but
that cosmologists are looking for it in all the wrong places. Where do I think
it is? In a gigantic black hole at the center of the universe.
Now, before you assure me that the universe has no center, understand that I'm
talking about its center in spacetime, not in space. I.e., the center is the
point you arrive at if you run the expansion backwards to the Big Bang. From
any point in present-day space, it lies directly backwards in time.

eh, no.

1) Dark matter explains things throughout the universe such as the shape, distribution and behaviour of galaxies, clusters, etc. It has nothing to do with a central mass such as 'gigantic black hole'*

2) A central mass has a g effect of 1/r^2 (some relevance to the enlightened of this ng) so no matter how massive, a BH remains an infinitely compact volume and distance geometrically dilutes g attraction to things elsewhere in the u. Yet, dark matter effects appear to be uniform throughout galaxies (I'm not sure about intergalactic space, but when I get there I'll send photos).

3) Notwithstanding dark matter, not to mention the notion of a center of the universe, if the big crunch occurs, it will likely converge to a point near where the origin 'was', but that does not mean there is or was a vestigial BH at/near that location. After all, during the big crunch time continues in a single direction. Time will not reverse.

*There is a gigantic black hole at the center of our galaxy. However there is no matter for it to consume (therefore no polar jets). This black hole is there but is not 'feeding', there is nothing to feed it other than random objects that cross the EH.


: As to Hawking radiation, it may be observed in the LHC once it's up and : running next year (though it may take a few years for a micro BH to : form, evaporate and the event actually recorded.)
: : I hope it's observed. Hawking would certainly receive the Nobel Prize : in Physics if it is observed. I just hope it's not posthumous.

I guess I hope it isn't. But keep looking anyway. And whatever the outcome,
Hawking probably deserves the NP, just for getting so many people interested
in the origin, structure, and fate of the universe.

You only get the NP for fact not theory. Until it's observed (or made to happen such as in the LHC [maybe]) or until he comes up with something more pedestrian and proveable/observable, he's SOL.

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