researcher1 Posted February 5, 2011 Share Posted February 5, 2011 Hello! I have a question. We know TEGR is obtained when we choose f(T) = T. I think it means this case is identical with f® = R, i.e. we obtain the same friedmann equations in both models. Also, we know that if we want to study a \Lambda CDM model in f® theory the Lagrangian density is something like R - 2*\Lambda. I need to know is there a similar Lagrangian density for \Lambda CDM model in f(T) gravity or not. I think it has a form like T-2*\Lambda. Am I wrong? Link to comment Share on other sites More sharing options...
ajb Posted February 5, 2011 Share Posted February 5, 2011 (edited) So this is related to teleparallel gravity? Which is describing gravity as torsion and not curvature. I know that teleparallel gravity can be equivalent to general relativity for certain choices of parameters. As for f(T) gravity I have no idea. I am not familiar with it. All I can suggest is a good hunt through the literature. Does the following paper help? Puxun Wu, Hongwei Yu, Observational constraints on $f(T)$ theory, Phys.Lett.B693:415-420,2010 (arXiv:1006.0674v5 [gr-qc]) Edited February 5, 2011 by ajb Link to comment Share on other sites More sharing options...
researcher1 Posted February 5, 2011 Author Share Posted February 5, 2011 thanks ajb, but I've read it and more papers like it, but they haven't siad it clearly. Link to comment Share on other sites More sharing options...
ajb Posted February 5, 2011 Share Posted February 5, 2011 I don't think anyone on here can really help you. I do not know anyone here that is working on f(T) gravity or anything that close. As you are familiar with the literature, pick someone who has published on f(T) gravity and ask them. I am sure they will not mind attempting to answer that for you. Is this part of a PhD project or something? Sorry I can't be more helpful. Link to comment Share on other sites More sharing options...
researcher1 Posted February 5, 2011 Author Share Posted February 5, 2011 That's right. Thanks a lot! Link to comment Share on other sites More sharing options...
ajb Posted February 5, 2011 Share Posted February 5, 2011 What has your supervisor said about this? He maybe able to suggest who to ask, if he is not sure himself. Link to comment Share on other sites More sharing options...
researcher1 Posted February 5, 2011 Author Share Posted February 5, 2011 I wanted to solve this problem myself. Thanks anyway. Link to comment Share on other sites More sharing options...
ajb Posted February 5, 2011 Share Posted February 5, 2011 (edited) I wanted to solve this problem myself. Thanks anyway. Ok. My general advice would be not to be scared about asking supervisors for advice and direction. I think I made that mistake myself and wasted plenty of time during my PhD. Anyway, good luck and I hope you can solve this. Let us know how you get on. Edited February 5, 2011 by ajb Link to comment Share on other sites More sharing options...
researcher1 Posted February 5, 2011 Author Share Posted February 5, 2011 Thanks for your friendly advice. Link to comment Share on other sites More sharing options...
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