I'm reading the 100 years anniversary edition of Sci-am and there is an article called "The Search for Relativity Violations". Some passages perplexed me: "In the case of relativity violations, the equations describing the stick and the applied force are replaced by the equations of the ultimate theory. In place of the stick are the quantum fields of matter and forces. The natural background strength of such fields is usually zero. In certain situations, however, the background fields acquire a nonzero strength. Imagine that this happened for the electric field. Because the electric field has a direction (technically, it is a vector), every location in space will have a special direction singled out by the direction of the electric field. A charged particle will accelerate in that direction. Rotational symmetry is broken (and so is boost symmetry). The same reasoning applies for any nonzero “tensor” field; a vector is a special case of a tensor. Such spontaneous nonzero tensor fields do not arise in the Standard Model, but some fundamental theories, including string theory, contain features that are favorable for spontaneous Lorentz breaking." It mentioned electric field breaks Lorentz symmetry yet it added the standard model doesn't break Lorentz symmetry.. isn't electric field part of the standard model? When you add magnetic field to electric field to become electromagnetic field.. does it break Lorentz symmetry (so called rotational symmetry and boost symmetry) And what does it mean the fundamental theory may break Lorentz symmetry. Is the consequence for example the strings may all be non-locally connected throughout the universe but at large scale, relativity is a low energy limit. But if the strings can communicate.. won't this cause backward in time causality problem in the low energy limit? How do you make it compatible the low energy obey relativity while at high energy it doesn't?