微扰约束下的引力：没有新自由度的暗能量
Gravity with Perturbative Constraints: Dark Energy Without New Degrees of Freedom
摘要：
未来十年的主要观测工作旨在探索暗能量的状态方程。测量状态方程参数w与-1的偏差将表明存在一种暗能量，它不能仅仅用宇宙学常数来表示。虽然人们通常认为，任何隐含的修改的LambdaCDM模型相当于增加新的动力学领域，我们在这里提出了一个框架，调查是否需要这样的新领域时，宇宙学观测相结合的一组最小的假设引力物理的性质。在我们的方法中，我们将额外的自由度视为微扰约束，并计算了一些可观测的量，如哈勃膨胀率和宇宙加速度，对于一个均匀的宇宙。我们表明，目前的观测将我们的宇宙在我们的框架的微扰有效性，并允许在宇宙尺度的非动力学引力自由度的存在。
英文摘要：
Major observational efforts in the coming decade are designed to probe the equation of state of dark energy. Measuring a deviation of the equation-of-state parameter w from -1 would indicate a dark energy that cannot be represented solely by a cosmological constant. While it is commonly assumed that any implied modification to the LambdaCDM model amounts to the addition of new dynamical fields, we propose here a framework for investigating whether or not such new fields are required when cosmological observations are combined with a set of minimal assumptions about the nature of gravitational physics. In our approach, we treat the additional degrees of freedom as perturbatively constrained and calculate a number of observable quantities, such as the Hubble expansion rate and the cosmic acceleration, for a homogeneous Universe. We show that current observations place our Universe within the perturbative validity of our framework and allow for the presence of non-dynamical gravitational degrees of freedom at cosmological scales.
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