论文标题
用宇宙微波背景测试重力：对修饰的重力的约束，并具有两个紧张的自由度
Testing gravity with the cosmic microwave background: constraints on modified gravity with two tensorial degrees of freedom
论文作者
论文摘要
我们提供了具有两个紧张的自由度，没有额外传播标量模式的修饰重力测试。我们认为的重力理论接受了一个宇宙学模型，该模型与背景演化水平上的$λ$ CDM模型无法区分。该模型具有单个修改的重力参数$β$，尽管没有额外的标量模式在传播中，但在线性扰动中可以看到其效果。使用修改的Boltzmann代码合并本模型，我们从Planck CMB数据中得出了约束$ -0.047 <β<-0.028 $ th 68 $ \％$的信心。由于我们的修改重力模型几乎无法受到太阳系测试和重力波传播的限制，因此我们的结果提供了该模型的首次观察测试。
We provide a cosmological test of modified gravity with two tensorial degrees of freedom and no extra propagating scalar mode. The theory of gravity we consider admits a cosmological model that is indistinguishable from the $Λ$CDM model at the level of the background evolution. The model has a single modified-gravity parameter $β$, the effect of which can be seen in linear perturbations, though no extra scalar mode is propagating. Using the Boltzmann code modified to incorporate the present model, we derive the constraints $-0.047 < β< -0.028$ at 68$\%$ confidence from Planck CMB data. Since our modified gravity model can hardly be constrained by the Solar System tests and gravitational-wave propagation, our result offers the first observational test on the model.
