CMB中加速度的参数化后Friedmann特征
Parametrized Post-Friedmann Signatures of Acceleration in the CMB
摘要：
我们扩展协变的，参数化后弗里德曼宇宙加速处理从修改后的重力物质，辐射，相对论组件和空间曲率的任意混合物。明确的表达在共动，牛顿和同步规范方便适应的爱因斯坦-玻尔兹曼代码解决CMB和物质微扰的线性制度。利用共动规范码，我们通过积分的Sachs-Wolfe效应研究了度规演化对CMB的影响。修正的重力可以改变低多极谱，包括降低四极的功率。从主成分描述的主要度量比参数，我们得到一般的约束WMAP修改后的重力模型的加速度。
英文摘要：
We extend the covariant, parametrized post-Friedmann treatment of cosmic acceleration from modified gravity to an arbitrary admixture of matter, radiation, relativistic components and spatial curvature. Explicit expressions in the comoving, Newtonian and synchronous gauges facilitate the adaptation of Einstein-Boltzmann codes for solving CMB and matter perturbations in the linear regime. Using a comoving gauge code, we study the effect of metric evolution on the CMB through the integrated Sachs-Wolfe effect. Modified gravity can alter the low multipole spectrum, including lowering the power in the quadrupole. From a principal component description of the primary metric ratio parameter, we obtain general constraints from WMAP on modified gravity models of the acceleration.
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