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:(adsbygoogle = window.adsbygoogle || []).push({});

"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?

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# B "The search for Relativity Violations"

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