标题： 宇宙常数的跳跃松弛 显示英文标题

标题： Saltatory Relaxation of the Cosmological Constant

摘要： 我们修改并扩展了Brown和Teitelboim之前的提议，通过与三指数规范势耦合的膜的核化来放松有效的宇宙学项。 来自弦/M理论的微观考虑表明该框架有两个主要创新。 首先，膜特性对额外维度紧致化的依赖可能会产生一个非常小的量子化单位，用于有效宇宙学项的变化。 其次，多重重合膜的内部自由度可能会通过状态密度因子的指数级增大来增强隧穿率。 这些新特性基本上改变了放松动力学。 通过要求在宇宙寿命尺度上的稳定性，而不是绝对稳定性，我们推导出超对称破缺尺度与宇宙学项值之间的非平凡关系。 这在自然界中可能是合理的，但并非一定成立。 显示英文摘要

摘要： We modify and extend an earlier proposal by Brown and Teitelboim to relax the effective cosmological term by nucleation of branes coupled to a three-index gauge potential. Microscopic considerations from string/M theory suggest two major innovations in the framework. First, the dependence of brane properties on the compactification of extra dimensions may generate a very small quantized unit for jumps in the effective cosmological term. Second, internal degrees of freedom for multiply coincident branes may enhance tunneling rates by exponentially large density of states factors. These new features essentially alter the relaxation dynamics. By requiring stability on the scale of the lifetime of the universe, rather than absolute stability, we derive a non-trivial relation between the supersymmetry breaking scale and the value of the cosmological term. It is plausibly, though not certainly, satisfied in Nature.