http://pirsa.org/11100056/ Can Lorentz Symmetry be Emergent? Speaker(s): Ted Jacobson Abstract: I will begin by discussing some of the strongest observational evidence for Lorentz symmetry, and the essential role that Lorentz symmetry appears to play in the consistency of black hole thermodynamics. Next I will discuss some reasons for suspecting that Lorentz symmetry may nevertheless be emergent. And finally I will discuss difficulties with the concept of emergent Lorentz symmetry, and how such difficulties might conceivably be overcome. Date: 27/10/2011 - 3:30 pm Collection: Emergence and Effective Field Theories Conference This might be a good place to start for anyone interested in the question. Ted Jacobson is a central figure in this line of investigation. Could there be a latent preferred frame in nature, which we just have not detected? Whose effects are too subtle to notice except, say, at very small or very large scale? Quite probably NOT, but how can we rule this out? One useful result of Jacobson's work, and others, is that by figuring out all the ways that Lorentz violation might be present but concealed, they stimulate people to test---and perhaps eventually rule the possibility out. This video is a total 68 minutes, but Jacobson's talk is only the first 27 minutes. Then there are about 20 minutes of questions directed by the conference/workshop audience to Jacobson. At about 47 minutes questions begin to be directed to speakers who presented talks earlier in the day. Occasionally getting back to T.J. but very wide ranging. The focused part of the video is just the first 47 minutes.