Reheating and primordial gravitational waves in generalized Galilean genesis
Reheating and primordial gravitational waves in generalized Galilean genesis
复制标题
广义伽利略起源中的再加热和原初引力波
DOI：
10.1088/1475-7516/2016/04/018
复制
发表时间：
2016
影响因子：
6.4
通讯作者：
Sakine Nishi and Tsutomu Kobayashi
中科院分区：
文献类型：
--
作者：
Sakine Nishi;Tsutomu Kobayashi;Sakine Nishi and Tsutomu Kobayashi
伽利略起源是暴胀的另一种选择，宇宙从闵可夫斯基开始膨胀，并稳定地违反零能量条件。在本文中，我们讨论了早期宇宙如何通过引力粒子的产生，在从起源阶段过渡到随后的阶段，标量场的动能占主导地位的再加热。然后，我们研究了伽利略起源后引力再加热对原始引力波谱的影响。所得的光谱是强蓝色的，并且在高频下以每单位对数频率的能量密度表示为Ω gw <$f 3。尽管现有探测器无法检测到这一点，但在f 100 MHz下，振幅可以高达Ω gw 10 - 12，为未来的成因场景提供了测试。分析是在广义伽利略起源的Horndeski理论的基础上，这使我们能够推导出通用公式的框架内进行。
Galilean genesis is an alternative to inflation, in which the universe starts expanding from Minkowski with the stable violation of the null energy condition. In this paper, we discuss how the early universe is reheated through the gravitational particle production at the transition from the genesis phase to the subsequent phase where the kinetic energy of the scalar field is dominant. We then study the consequences of gravitational reheating after Galilean genesis on the spectrum of primordial gravitational waves. The resultant spectrum is strongly blue, and at high frequencies Ω gw∝ f 3 in terms of the energy density per unit logarithmic frequency. Though this cannot be detected in existing detectors, the amplitude can be as large as Ω gw∼ 10− 12 at f∼ 100 MHz, providing a future test of the genesis scenario. The analysis is performed within the framework of generalized Galilean genesis based on the Horndeski theory, which enables us to derive generic formulas.