The leading kink mass splitting in the MSTB model is proportional to exp(-4m^2 α^3/(3√2 λ)).
Double well ground state energy splitting (or instanton flipping rate); rendering the implicit explicit
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A prime example of quantum tunnelling is the semiclassical 'energy splitting' of the levels of a symmetrical double well potential, or equivalently the flipping rate of an instanton. Curiously the accepted expression for the ground state energy splitting in terms of the (smooth) potential function has not been pursued to the full explicitness available from classical mechanics. This implicitness is rectified here.
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Instanton Corrections to the MSTB Kink Mass
The leading kink mass splitting in the MSTB model is proportional to exp(-4m^2 α^3/(3√2 λ)).