New answers tagged solitons
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Time dependent mass terms in field theory
This kind of thing comes up a lot in cosmology, and can be completely fine.
One caveat to be aware of: if the time dependent mass for $\phi$ arose as a coupling due to another field $\chi$, then you ...
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5
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Energy of moving Sine-Gordon breather
Since the sine-Gordon theory is $SO(1,1)$ invariant, if you can find the energy for the stationary breather, you can find it for a moving breather as well. All that is required is a Lorentz boost; ...
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