标题： 标量电荷在1+1D和2+1D中的不稳定性 显示英文标题

标题： Instability of scalar charges in 1+1D and 2+1D

摘要： 我们研究了标量电荷——一个作为非相互作用标量场源的点粒子——在(1+1)维和(2+1)维平直时空中的质量损失现象。 我们发现这样的粒子对自相互作用不稳定：它们通过发射偶极辐射而失去质量。 这与(3+1)维平直时空中的标量电荷形成鲜明对比，在那里不会发生这种现象。 显示英文摘要

摘要： We study the phenomenon of mass loss by a scalar charge -- a point particle which acts as a source for a (non-interacting) scalar field -- in (1+1)-dimensional and (2+1)-dimensional flat spacetime. We find that such particles are unstable against self interaction: they lose their mass through the emission of monopole radiation. This is in sharp contrast with scalar charges in (3+1)-dimensional flat spacetime, where no such phenomenon occurs.