CDT

Having read and heard a little bit about Causal Dynamical Triangulations, I was wondering if anyone here has also even heard of it or knows more about it than I do (which is very likely if so!).

Links to movies about this:

http://loops05.aei.mpg.de/index_files/abstract_loll.html

http://loops05.aei.mpg.de/index_files/abstract_baez.html

One homepage (the other link was broken)

http://www.phys.uu.nl/~loll/Web/research/research.html

And

http://xstructure.inr.ac.ru/x-bin/theme3.py?level=2&index1=-24548

Thanks in advance!

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yes CDT pos

currently, downloading links 1 & 2. read most of link 3. in this one [link 3] i think i fall on the fence. i am in the perturbative camp, i would say.  ~ another; that, is: ....some QG, but, no LQG.

You are saying that you support some theory of quantum gravity but not loop quantum gravity?

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briefly to say ~:

~~ agreeing mainly with perturbation theory, that is:

a complicated quantum system in terms of a simpler one

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YES to QG re:  unifying  QM and GR

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NO to LQG, re: ..an extremely fine fabric or network "weaved" of finite quantised loops of excited gravitational fields  et cetera. ~ YES, to: GR [within LQG], but, ~ NO [..really 50-50:] the exclusion of string theory's higher dimensions, NO spin networks etc ~

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~ ~ general. sic

GR = general relativity

LQG = loop quantum gravity

QG = quantum gravity

QM = quantum mechanics

SR = special relativity

Could someone explain quantum foam to me?

Well basically at the Planck Scale (10^-43 cm.) due to the uncertainty principle, particles and energy can "spontaneously" appear and quickly annihilate while still conserving energy laws. Since spacetime is curved, at sufficiently small scales the energy of the fluctuations would be sufficient enough to bend space to a foamy shape. This is only apparent at very small scales.

Any opinions about this?