论文标题
双场理论中的宇宙学扰动
Cosmological Perturbations in Double Field Theory
论文作者
论文摘要
我们探讨了关于时间依赖性（宇宙学）背景的扰动双场理论。在这个顺序上，理论在弱约束的意义上是一致的，因此对于环形几何形状，它都编码动量和真正的绕组模式。我们对一致性问题及其解决方案进行了独立的讨论，包括Cocycle因素的作用和$ O（D，D，\ Mathbb {Z}）$ duality。最后，作为朝着宇宙相关函数计算的第一步，我们提出了广义标量 - 矢量调节器分解，并使用它来构建规格不变的概括性bardeen变量。与标准宇宙学相比，张量模式较少，但更多的向量和标量模式。
We explore perturbative double field theory about time-dependent (cosmological) backgrounds to cubic order. To this order the theory is consistent in a weakly constrained sense, so that for a toroidal geometry it encodes both momentum and genuine winding modes. We give a self-contained discussion of the consistency problems and their resolution, including the role of cocycle factors and the $O(d,d,\mathbb{Z})$ duality. Finally, as a first step toward the computation of cosmological correlation functions, we propose a generalized scalar-vector-tensor decomposition and use it to construct gauge invariant generalized Bardeen variables. Compared to standard cosmology there are fewer tensor modes but more vector and scalar modes.
