标题： 无质量粒子与标量场的耦合 显示英文标题

标题： On the coupling of massless particles to scalar fields

摘要： 研究了在具有经典粒子的特殊相对论理论中，无质量粒子是否可以与标量场耦合。 唯一可能的显然在洛伦兹变换和仿射参数重参数化下不变的理论会导致无质量情况下的轨迹为平凡轨迹（直线），并且对质量理论的无质量极限进行研究也表明，标量场对极限轨迹没有影响。 另一方面，与此结果相反，显示在此理论中，即使在极端相对论极限下，有质量粒子也会受到标量场的影响。 显示英文摘要

摘要： It is investigated if massless particles can couple to scalar fields in a special relativistic theory with classical particles. The only possible obvious theory which is invariant under Lorentz transformations and reparametrization of the affine parameter leads to trivial trajectories (straight lines) for the massless case, and also the investigation of the massless limit of the massive theory shows that there is no influence of the scalar field on the limiting trajectories. On the other hand, in contrast to this result, it is shown that massive particles are influenced by the scalar field in this theory even in the ultra-relativistic limit.