Who's Afraid of Lorentz Symmetry Breaking?
Matt Visser
(Victoria University of Wellington, NZ)
Is Lorentz symmetry truly fundamental? Or is it just an "accidental" low-momentum emergent symmetry? Opinions on this issue have undergone a radical mutation over the last few years. Historically, Lorentz symmetry was considered absolutely fundamental --- not to be trifled with --- but for a number of independent reasons the modern viewpoint is more nuanced. What are the benefits of Lorentz symmetry breaking? What can we do with it? Why should we care?