On Tue, Jan 21, 2014 at 06:18:16AM -0800, [email protected] wrote: > > On Monday, January 20, 2014 4:01:03 PM UTC, Edgar L. Owen wrote: > > > > All, > > > > > > Here's one more theory from the many in my book on Reality: > > > > > > As Misner, Thorne and Wheeler note briefly in their book on Gravitation, > > INTERgalactic space is continually expanding with the Hubble expansion, > > however INTRAgalactic space is NOT expanding because it is gravitationally > > bound. > > > > Now the obvious effect of this (as I'm the first to have pointed out so > > far as I know) is that space will necessarily be warped at the boundaries > > of galaxies, and as is well know from GR any curvature of space produces > > gravitational effects, and of course dark matter halos around the EDGES of > > galaxies were invented to explain the otherwise unexplained extra > > gravitational effects on the rotation of galaxies. > > > > Thus, this simple effect of space warps around the boundaries of galaxies > > caused by the Hubble expansion may be the explanation for the dark matter > > effect. > > > > It may or may not be the cause of the entire effect, but it certainly must > > be having SOME effect, and over the lifetime of the universe one would > > expect that warping effect to be quite large. > > > > And there is nothing to prevent these warps, once they are created, to > > have a life and movement of their own, as we now know that dark matter is > > not just concentrated around galactic halos but may indicate where they > > used to be.... > > > > I'd be interested to see if anyone else sees how this effect might explain > > dark matter... > > > > Edgar > > > > It's an idea but I don't really get why expanding one side and not the > other translates to a physical gradient. Conceptual presentations of the > difference in gradient terms are feasible, but nothing is carried by that > alone. > > I don't personally endorse comparing one theory to another with a view to > keep one and delete the other. I do think there is good method and bad > method though. What your idea looks like to me, is a seed insight. That is > the very first step on a pretty long road to a theory. IMHO it's really > poor form to burn someone else's seed insight. But it's terrible form to > present a seed insight as if it's more. > > There needs to be a translation to some basic independent reality check. It > doesn't have to be a lot, but getting a foothold there delivers something a > million eloquent words will not. The idea is checkable in various ways. > Whole clusters of galaxies may be gravitationally bound. Are you able to > translate your idea to an expectation of some kind of distinction between > halos around those galaxies? >
This para of Al's hits the nail on the head for me. To be convincing, one needs to do the actual stress-strain calculations to see if it can reproduce the well known empirical rotation curve of the Milky Way. Realistically, this is beyond my capabilities at present, and beyond my interest levels to learn :). My gut feeling here is that space doesn't wrinkle near galactic boundaries, but rather there would be a smooth pressure that increases the further you are from the galactic centre, due to the expansion of the universe. It boggles the mind that that would have been overlooked by cosmologists, though. Another thing to bear in mind is that all galaxies within the local group are gravitationally bound, including the two best know members, Andromeda and our own Galaxy. Taking your interpretation of MTW's comment literally would imply we shouldn't see the affect of space "wrinking" until we get to the halo of the local group, but the dark matter problem is clearly observed in the rotation curve of the Milky Way. Cheers -- ---------------------------------------------------------------------------- Prof Russell Standish Phone 0425 253119 (mobile) Principal, High Performance Coders Visiting Professor of Mathematics [email protected] University of New South Wales http://www.hpcoders.com.au ---------------------------------------------------------------------------- -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
