Am I correct in understanding that in the cosmological version of Loop quantum gravity, namely Loop quantum cosmology, the universe in all models starts with a big bounce? Are there other models, for example, the pre-big bang condition with unconnected loops?
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Loop Quantum Cosmology is a finite, Symmetry reduced model of LQG, which for a layman means it arose from Loop Quantum Gravity. It predicts a Quantum bridge between the Expansion and the Contraction of the Cosmological branches. So, instead of having Big Bang, you have a Big Bounce. Loop Quantum Cosmology aims to describe a lot more than Bounce, it mathematically describes the Inflation in the Early Universe. For more, you can read the articles of Francessca Vidotto and Aurelien Barrau. The first Link is given here. https://tel.archives-ouvertes.fr/tel-01737503. They talk about some basic aspects of Loop Quantum Cosmology and the Loop Quantum Cosmology aspects of the Dark Universe
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$\begingroup$ Are there other models, for example, the pre-big bang condition with unconnected loops? $\endgroup$ Commented Nov 8, 2020 at 12:50
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$\begingroup$ Again your question can't be answered if you give more clarity, because it is not currently accepting answers. Please tell us for us to answer what are the conditions/models you are asking for so that we can understand what you want to say. $\endgroup$– user275163Commented Nov 8, 2020 at 13:05
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$\begingroup$ I'm talking about loop quantum gravity and describing the cosmology of the early universe (before the big bang) using this model. $\endgroup$ Commented Nov 8, 2020 at 15:11
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1$\begingroup$ Not universes. And separate, separable loops. $\endgroup$ Commented Nov 8, 2020 at 16:17
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1$\begingroup$ I mean, the loops do not interact with each other, so there is no classical space-time. This is the state of non-interacting loops. But suddenly they begin to interact, form spin foam, which on large scales manifests itself as classical space-time. $\endgroup$ Commented Nov 8, 2020 at 17:07