论文标题
对重力问题的新颖解决方案
A Novel Solution to the Gravitino Problem
论文作者
论文摘要
在具有局部超对称性的一般现象学模型中，早期宇宙中产生的大量重力量倾向于违反许多数量级的已知暗物质密度。在IIB型字符串理论中的Brane世界情景中，我们提出了一种逃避这个问题的新方法。在那里，强烈的和电动相互作用的标准模型生活在反 - $ {\ rm d3} $ - branes（$ \ overline {\ rm d3} $ -Branes）中，跨越了3个大空间尺寸。在这里，重力杆（要变得庞大）吸收的“潜在” Goldstino是开放式弦乐nilpotent Superfield $ x $（即$ x^2 = 0 $）的费米亚组成部分，它仅在$ \ overline {\ rm d3} $ - branes中。这种非线性超级强烈场景提供了两种解决Gravitino问题的方法，并具有非常不同的粒子物理现象。
In a general phenomenological model with local supersymmetry, the amount of massive gravitinos produced in early universe tends to violate the known dark matter density bound by many orders of magnitude. In the brane world scenario in Type IIB string theory, we propose a novel way to evade this problem. There, the standard model of strong and electroweak interactions live inside the anti-${\rm D3}$-branes ($\overline{\rm D3}$-branes) that span the 3 large spatial dimensions. Here, the "potential" Goldstino to be absorbed by the gravitino (to become massive) is the fermion component of the open string nilpotent superfield $X$ (i.e., $X^2=0$) which is present only inside the $\overline{\rm D3}$-branes. This non-linear supergravity scenario offers 2 ways to solve the gravitino problem, with very different particle physics phenomenologies.
