论文标题
模拟通货膨胀
Mimetic Inflation
论文作者
论文摘要
我们研究了模拟物重力扩展的通货膨胀溶液，较高的衍生相互作用与重力结合。由于具有较高的衍生性相互作用，因此该设置在拥有许多新型属性的同时，没有幽灵和梯度不稳定性。标量扰动的分散关系会形成与幽灵通货膨胀的设置相似的四分之一动量校正。此外，张量扰动的倾斜可以在倾斜和张量扰动幅度之间具有修改的一致性关系的符号。尽管存在较高的衍生相互作用与重力相连，但张量的扰动以等于Ligo观测的光速速度传播。此外，较高的衍生相互作用会引起立方汉密尔顿的非平凡相互作用，在各种形状（例如等边，正交和挤压构型）中产生非陶氏性，并具有可观察的幅度。
We study inflationary solution in an extension of mimetic gravity with the higher derivative interactions coupled to gravity. Because of the higher derivative interactions, the setup is free from the ghost and gradient instabilities while it hosts a number of novel properties. The dispersion relation of scalar perturbations develops quartic momentum correction similar to the setup of ghost inflation. Furthermore, the tilt of tensor perturbations can take either signs with a modified consistency relation between the tilt and the amplitude of tensor perturbations. Despite the presence of higher derivative interactions coupled to gravity, the tensor perturbations propagate with a speed equal to the speed of light as required by the LIGO observations. Furthermore, the higher derivative interactions induce non-trivial interactions in cubic Hamiltonian, generating non-Gaussianities in various shapes such as the equilateral, orthogonal, and squeezed configurations with observable amplitudes.
