In this 2013 Nature article there is a short presentation of the causal dynamical triangulations approach to quantum gravity, where it is said

Intriguingly, the simulations also hint that soon after the Big Bang, the Universe went through an infant phase with only two dimensions — one of space and one of time. This prediction has also been made independently by others attempting to derive equations of quantum gravity, and even some who suggest that the appearance of dark energy is a sign that our Universe is now growing a fourth spatial dimension. Others have shown that a two-dimensional phase in the early Universe would create patterns similar to those already seen in the cosmic microwave background.

but unfortunately there are no references to who the "some" and "others" are. What are these theories where the number of spatial dimensions of the universe is not constant over its history?

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    $\begingroup$ The article has a list of references. Did you look up those papers? $\endgroup$ – CuriousOne Jun 1 '16 at 10:35
  • $\begingroup$ in each chapter there is a name attached to the theories, and the name appears in the references. It is the way to find the pubications $\endgroup$ – anna v Jun 1 '16 at 12:14
  • $\begingroup$ Of course I did check the references. The single one pertaining to the CDT chapter is this one. That's reference number 10 in the article. The passage I cited comes after that, and talks about work from other people, to which no references are given, as stated in my question. $\endgroup$ – Stéphane Rollandin Jun 1 '16 at 12:30
  • $\begingroup$ You are asking how to search on the web for new research. 1)take the names in the reference 10 and google. A wiki article comes out : en.wikipedia.org/wiki/Causal_dynamical_triangulation , in the article a talk comes out: loops05.aei.mpg.de/index_files/abstract_loll.html . $\endgroup$ – anna v Jun 1 '16 at 14:53
  • $\begingroup$ @annav. I don't think there is an answer to my question in the video you linked. I am not looking for a presentation of CDT, but for pointers to the theories mentioned by the Nature article (which are not CDT if I can read correctly). $\endgroup$ – Stéphane Rollandin Jun 2 '16 at 9:56

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