论文标题
一般相对论中标准星系偏置模型的不兼容
Incompatibility of Standard Galaxy Bias Models in General Relativity
论文作者
论文摘要
银河系偏置的标准模型是在牛顿框架中构建的，过去已经尝试将其置于相对论框架中。但是，过去作品的重点是使用相同的牛顿公式，但要通过固定仪表条件或转换为局部坐标系统，可以在相对论框架中提供其解释。在这里，我们证明了这些反向工程的方法不尊重一般相对性中的差异对称性，我们需要开发一个与兼容的星系偏差的协变量模型。我们考虑了一个用于银河系偏差的简单玩具模型，并讨论了测量原始非高斯性的影响。
The standard model for galaxy bias is built in a Newtonian framework, and several attempts have been made in the past to put it in a relativistic framework. The focus of past works was, however, to use the same Newtonian formulation, but to provide its interpretation in a relativistic framework by either fixing a gauge condition or transforming to a local coordinate system. Here we demonstrate that these reverse-engineered approaches do not respect the diffeomorphism symmetry in general relativity, and we need to develop a covariant model of galaxy bias that is diffeomorphism compatible. We consider a simple toy model for galaxy bias and discuss the impact for measuring the primordial non-Gaussianity.
