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Natural Science Forum / Physics / Research / December 2007QG/QM without spacetime
I'm beginning a research on the different approaches to QG (or also calssical QM) where the attempt to introduce the notion of spacetime as an emergent concept is made. I would like to find for introductory material which describes in one (or few) papers these different approaches giving first an overview on the subject. Can anyone suggest some? If there is none, please suggest the approaches/theories/ speculations (in string theory, CQG, or even alternative theories) you believe are actually the most interesting/promising in potentially describing physics where space and time no longer is a foundation but only a low energy emerging property. Thank you, Mark. > I'm beginning a research on the different approaches to QG (or also > calssical QM) where the attempt to introduce the notion of spacetime [quoted text clipped - 6 lines] > describing physics where space and time no longer is a foundation but > only a low energy emerging property. I don't know if there's a really comprehensive review of such approaches. For relatively popular ones you may want to start with the review article by Renate Loll Renate Loll, "Discrete Approaches to Quantum Gravity in Four Dimensions", Living Rev. Relativity 1, (1998), 13. URL: http://www.livingreviews.org/lrr-1998-13 And from the works of the speakers from this recent Workshop on Emergent Spacetime held at the Perimeter Institute in 2005: http://streamer.perimeterinstitute.ca/mediasite/viewer/FrontEnd/Front.aspx?cid=a 9b1d20a-efa7-485f-8d5d-3b62fb7d3e4c&shouldResize=False There is no shortage of more exotic proposals. However, you'd have to hunt the literature for them and evaluate them on your own. Hope this helps. Igor On 3 Nov., 16:23, "astroques...@gmail.com" <astroques...@gmail.com> wrote: > I'm beginning a research on the different approaches to QG (or also > calssical QM) where the attempt to introduce the notion of spacetime > as an emergent concept is made. See gr-qc/0205035 for my approach. Ilja > if there is none, please suggest the approaches/theories/ > speculations (in string theory, CQG, or even alternative theories) you > believe are actually the most interesting/promising in potentially > describing physics where space and time no longer is a foundation but > only a low energy emerging property. There is a number of penetrating papers by J. Barbour http://arxiv.org/abs/gr-qc/0309089 http://arxiv.org/abs/gr-qc/0012089 (and other related papers cited in the first reference above), as well as his book "The End of Times", (Oxford Univ Press, 2000). See also http://arxiv.org/abs/gr-qc/0610061 (pages 107-163), and a recent work http://arxiv.org/abs/0712.3660 for my approach. >... please suggest the approaches/theories/ >speculations (in string theory, CQG, or even alternative theories) you >believe are actually the most interesting/promising in potentially >describing physics where space and time no longer is a foundation but >only a low energy emerging property. This paper was published back in 1996 Pregeometric modelling of the spacetime phenomenology Phys.Lett. A223 (1996) 313-319 http://arxiv.org/abs/gr-qc/9605018 The above modelling eventually led to the development of unconventional physics and cosmology, but it may be of interest. A Quantum Cosmology: No Dark Matter, Dark Energy nor Accelerating Universe http://arxiv.org/abs/0709.2909 -- |
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