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arXiv 2501.02589hep-th
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BPS孤子的Feshbach共振与动力学

Feshbach resonances and dynamics of BPS solitons

Alberto García Martín-Caro, Jose Queiruga, Andrzej Wereszczynski

AI总结:

本研究在双标量场玩具模型中揭示Feshbach共振可改变BPS孤子测地线动力学,发现谱壁不受共振模衰减影响,推测三维受激't Hooft-Polyakov磁单极子散射中存在谱壁且轨迹会显著偏离测地线。

摘要:

我们在一个双标量场玩具模型中证明,BPS孤子的测地线动力学可通过激发Feshbach共振(即准束缚模)发生改变。该过程会产生一种由模生成的力,其强度由模空间上频率的谱流决定,且会因共振的束缚分量与散射分量之间的耦合而减弱。值得注意的是,谱壁不受共振模指数衰减的影响,因为衰减常数在谱壁处为零。我们的研究动机源自't Hooft-Polyakov磁单极子——这类磁单极子不存在真正的束缚态,却存在长寿命的半束缚激发态。我们的研究结果表明,三维受激磁单极子的散射过程中存在谱壁,其轨迹可能与未受激磁单极子模空间中的测地线运动产生显著偏离。

英文摘要:

We demonstrate that the geodesic dynamics of BPS solitons can be modified by the excitation of Feshbach resonances, or quasi-bound modes, in a toy model of two scalar fields. A mode-generated force emerges, with a strength determined by the spectral flow of the frequency on the moduli space, and weakened by the coupling between the bound and scattering components of the resonance. Notably, spectral walls persist unaffected by the resonant mode's exponential decay, as the decay constant vanishes at the spectral wall. Our motivation comes from the 't Hooft-Polyakov monopoles, which do not present true bound states but long lived semi-bound excitations. Our findings suggest the existence of spectral walls in the scattering of excited monopoles in three dimensions, whose trajectories may significantly deviate from the geodesic motion in the moduli space of unexcited monopoles.

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