On 10/29/2013 10:43 AM, Bruno Marchal wrote:


On 29 Oct 2013, at 17:12, Chris de Morsella wrote:

If true – ESA experimental measurements of the polarization of ranges of gamma rays (over a range of energies) from very distant gamma ray bursts that have travelled across billions of light years of spacetime to reach earth. Their experiments determined that spacetime does not have a granular structure, which would have had a measurable effect on the polarization of these distant gamma rays, down to a level of 10^-48 m (which is exceedingly small)) trillions of times smaller than the Planck scale. Spacetime does not appear to be granular – at least down to these incredibly small scales. These results have lead me to question any hypothesis that seems to depend on spacetime having a discreet granular structure.

Do you know if those are the results considered as "refuting" "loop gravity"?

I think so. The paper's at arXiv:1109.5191v2. I don't recognize the 1e-48m. The paper places a limit on the granularity of 525 Planck masses, which is inversely proportional to length, so it's shorter than 1/525 Planck lengths.

Brent


In fact, I find intuitive that a quantized gravitation lead to a quantization of space-time curvature, and itself, but comp seems to fit better with continuous space time, as it multitplies the comp-histories in a very smooth way. In the universal dovetailing, the winner "universal subdovetailers on the programs defined on some "rich ring" structure, might be the winner, but of course that remains to be shown.

Those questions are very hard.

Bruno




*From:*everything-list@googlegroups.com <mailto:everything-list@googlegroups.com> [mailto:everything-list@googlegroups.com]*On Behalf Of*spudboy...@aol.com <mailto:spudboy...@aol.com>
*Sent:*Tuesday, October 29, 2013 7:04 AM
*To:*everything-list@googlegroups.com <mailto:everything-list@googlegroups.com>
*Subject:*Universe from Pixels?
Here is a link, which makes things seem very, curious, if true.
http://www.dailygalaxy.com/my_weblog/2013/10/our-universe-is-made-up-of-indivisible-building-blocks-like-tiny-atoms.html#more
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