论文标题
IIB矩阵模型的紧急重力和宇宙常数的取消
Emergent gravity from the IIB matrix model and cancellation of a cosmological constant
论文作者
论文摘要
我们回顾了一个宇宙学模型，其中公制决定因素起动态作用，并在消除真空能量密度的取消（包括宇宙常数的贡献）上提出了新的数值结果。该模型的作用仅在与单位Jacobian的限制坐标转换下不变（在众所周知的宇宙学恒定问题的非模块性重力方法中出现相同的限制）。至于非标准术语在模型的作用中的可能起源，我们表明这些术语原则上可以源于IIB矩阵模型中的新兴重力，即超级曲线理论的非扰动表述。
We review a cosmological model where the metric determinant plays a dynamical role and present new numerical results on the cancellation of the vacuum energy density including the contribution of a cosmological constant. The action of this model is only invariant under restricted coordinate transformations with unit Jacobian (the same restriction appears in the well-known unimodular-gravity approach to the cosmological constant problem). As to the possible origin of the nonstandard terms in the matter action of the model, we show that these terms can, in principle, arise from the emergent gravity in the IIB matrix model, a nonperturbative formulation of superstring theory.
