light velocity variable, no dark energy needed
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From: Yousuf Khan on 2 Aug 2010 20:14 On 02/08/2010 5:37 PM, Sam Wormley wrote: > On 8/2/10 3:42 PM, Yevgen Barsukov wrote: >> >> Check out the new paper by Wun-Yi Shu on modification of general >> relativity >> that makes speed of light dependent on degree of universe expansion. >> Eliminates need for dark energy, presently needed to explain >> accelerated expansion (2/3 of all energy in the universe in present >> model). > > > Contradicted by observations. Always a bit quick on the draw aren't you Sam? The fact of the matter is that light speed cannot be measured outside of our local section of the universe. But a faster light speed in other sections of the universe would look exactly the same as the light speed in our section of the universe. The most basic explanation of light speed is that it is anything that travels one Planck length unit in one Planck time unit. If the Planck length and time were larger in other parts of the universe, such as in the voids between Galaxy superclusters, then it would look like light is travelling exactly as fast as it is now, but in reality it was going much faster. Yousuf Khan
From: Llanzlan Klazmon on 2 Aug 2010 20:27 On Aug 3, 8:42 am, Yevgen Barsukov <evgen...(a)gmail.com> wrote: > Check out the new paper by Wun-Yi Shu on modification of general > relativity > that makes speed of light dependent on degree of universe expansion. > Eliminates need for dark energy, presently needed to explain > accelerated expansion (2/3 of all energy in the universe in present > model). > > Popular explanation is here:http://www.physorg.com/news199591806.html > > Actual paper:http://arxiv.org/ftp/arxiv/papers/1007/1007.1750.pdf > > Looks promising, although more work is needed on deriving constants > from experimental data. I guess they rushed to publish this, > while working on more rounded up papers later. > > Regards, > Yevgen > > -- > Tune in to "Strange Drawing of the Day" buzz:http://www.google.com/profiles/100679771837661030957#buzz Actual trashing of Shu's paper here: http://badphysics.wordpress.com/2010/07/28/nobang/ Enjoy.
From: Sam Wormley on 2 Aug 2010 22:45 On 8/2/10 7:14 PM, Yousuf Khan wrote: > On 02/08/2010 5:37 PM, Sam Wormley wrote: >> On 8/2/10 3:42 PM, Yevgen Barsukov wrote: >>> >>> Check out the new paper by Wun-Yi Shu on modification of general >>> relativity >>> that makes speed of light dependent on degree of universe expansion. >>> Eliminates need for dark energy, presently needed to explain >>> accelerated expansion (2/3 of all energy in the universe in present >>> model). >> >> >> Contradicted by observations. > > Always a bit quick on the draw aren't you Sam? > > The fact of the matter is that light speed cannot be measured outside of > our local section of the universe. But a faster light speed in other > sections of the universe would look exactly the same as the light speed > in our section of the universe. Ref: http://einstein.stanford.edu/content/relativity/q651.html Q: How do we know that the speed of light is the same in every galaxy? A: We do not know this for absolute certain, but when we study the light from far away galaxies we see similar kinds of spectral lines as we see from elements close to us on the Earth. The relationships among the spectral lines in distant atoms also follow the same rules they do here, so the laws of atomic physics, and the value of fundamental constants that determine these physical laws seems to be the same everywhere. As for the speed of light being different in some galaxies, this would lead to a very complicated universe and there is no evidence that the universe is anything but the rather uniform thing that it is with laws and constants being the same everywhere we can look. Measurement of reflections in SN1987A in the Large Magellanic Cloud are consistent with the constant speed of light. Similarly neutrinos and photons arrival at earth from SN1987A are consistent with a the constant speed of light. Similar arguments are made for quasars and gravitational lensing.
From: Yousuf Khan on 3 Aug 2010 01:12 On 02/08/2010 10:45 PM, Sam Wormley wrote: > On 8/2/10 7:14 PM, Yousuf Khan wrote: >> Always a bit quick on the draw aren't you Sam? >> >> The fact of the matter is that light speed cannot be measured outside of >> our local section of the universe. But a faster light speed in other >> sections of the universe would look exactly the same as the light speed >> in our section of the universe. > > Ref: http://einstein.stanford.edu/content/relativity/q651.html > > Q: How do we know that the speed of light is the same in every galaxy? > > A: We do not know this for absolute certain, but when we study the light > from far away galaxies we see similar kinds of spectral lines as we see > from elements close to us on the Earth. The relationships among the > spectral lines in distant atoms also follow the same rules they do here, > so the laws of atomic physics, and the value of fundamental constants > that determine these physical laws seems to be the same everywhere. As > for the speed of light being different in some galaxies, this would lead > to a very complicated universe and there is no evidence that the > universe is anything but the rather uniform thing that it is with laws > and constants being the same everywhere we can look. > > Measurement of reflections in SN1987A in the Large Magellanic Cloud > are consistent with the constant speed of light. Similarly neutrinos > and photons arrival at earth from SN1987A are consistent with a the > constant speed of light. Similar arguments are made for quasars and > gravitational lensing. So how does whatever you copied and pasted contradict anything I said? Yousuf Khan
From: eric gisse on 3 Aug 2010 02:36
Yevgen Barsukov wrote: > > Check out the new paper by Wun-Yi Shu on modification of general > relativity > that makes speed of light dependent on degree of universe expansion. > Eliminates need for dark energy, presently needed to explain > accelerated expansion (2/3 of all energy in the universe in present > model). > > Popular explanation is here: > http://www.physorg.com/news199591806.html > > Actual paper: > http://arxiv.org/ftp/arxiv/papers/1007/1007.1750.pdf > > Looks promising [...] Not in the slightest. Typical arXiv nonsense. |