论文标题
非最小衍生耦合宇宙学和引力波的速度
Nonminimal Derivative Coupling Cosmology and the Speed of Gravitational Waves
论文作者
论文摘要
所谓的非微生导数耦合（NDC）是一般相对论的替代品，当应用于宇宙学时，它会产生渐近通货膨胀机制。在过去的十年中，引力波的检测对重力理论施加了非常严格的约束，这导致了这些理论的大规模修订，以研究它们与观测数据之间的兼容性。在本文中，我们回顾了NDC并解决了一个问题，是否与引力波兼容。我们表明，该理论中引力波的存在仅限于相空间的有限范围，并且没有与当天数据相兼容的加速溶液来兼容此类波的速度。到目前为止，我们还没有发现原始引力波，从而减轻了最后的结果。这些结论基于张量扰动速度的表达与相空间之间的比较。最后，考虑了一些可能的情况和解决方案。
The so-called Nonminimal Derivative Coupling (NDC) is an alternative to General Relativity, which produces an asymptotic inflationary mechanism when applied to cosmology. The detection of gravitational waves in the last decade has imposed very stringent constraints over gravitational theories, which gave rise to a massive revision of those theories, in order to investigate the compatibility between them and that observational data. In this paper, we review NDC and address the question if it is compatible with gravitational waves or not. We show that the very existence of gravitational waves in this theory is restricted to a limited range in phase space and there are no accelerated solutions compatible with the present day data for the speed of such waves. This last result is alleviated by the fact that we did not detect primordial gravitational waves so far. Those conclusions are based on the comparison between the expression for the speed of tensor perturbations and the phase space. Finally, some possible scenarios and solutions are considered.
