A Possible Lorentz Violation and Its Impact on Cosmology

由于观测的发展，检查洛伦兹不变性等基本原理变得很重要。此外，精确宇宙学促使我们研究理论的精细结构。无论它多么小，都值得详细探索。基于这一动机，我们研究了洛伦兹违背对宇宙学的影响。我们发现了一个各向异性的暴胀场景洛伦兹不变性被自发打破。在此背景下，我们还建立了宇宙微扰理论，并成功地预测了与未来宇宙微波背景辐射观测相关的各种观测结果。

Due to developments of observations, it becomes important to check the fundamental principle such as Lorentz invariance. Moreover, precision cosmology urged us to study theoretical fine structure. However small it is, it is worth exploring in detail. Based on this motivation, we have studied the impact of Lorentz violation on cosmology. We found an anisotropic inflationary scenario where Lorentz invariance is spontaneously broken. We also formulated cosmological perturbation theory in this background and succeeded in making predictions for various observables relevant to future observations of cosmic microwave background radiation.