Posted: Aug 10, 2010 9:21 am
chairman bill wrote:And then there's this ... which might just alter all sorts of things
http://www.newscientist.com/article/mg20727721.200-rethinking-einstein-the-end-of-spacetime.html
Ah yeah that's Horava gravity. He introduces some higher spatial derivative powers into the action (but keeps the time derivatives the same). This causes the propagators to have higher powers on the denominators, and hence be less prone to diverging. Hope is it's renormalisable.
I don't know much about it, but I think it needs some fine tuning of the parameters which go into it, but I guess it's early days yet....