标题： 宇宙引力子在纳赫兹和音频频段的平坦频谱 显示英文标题

标题： Flat spectra of cosmic gravitons in the nHz and audio bands

摘要： relic 引力子的谱通常在预期一致模型信号峰值的低频域归一化，这就是为什么它们对微波背景的温度和极化各向异性仅由张量-标量比描述的原因。 如果一致性关系被打破，则通过引入张量谱指数作为另一个独立参数来实现相同策略。 当谱能量密度的主要成分分布在远大于aHz的频率时，这种传统方法背后的逻辑就显得不那么有说服力了。 音频波段的改进限制以及nHz区域脉冲星计时阵列的当前数据激发了一种新的 relic 引力子宇宙背景绝对归一化策略。 在引入分析 relic 引力子的四维一般作用量后，新方法在常规和非常规暴胀模型的情况下得到了说明。 显示英文摘要

摘要： The spectra of the relic gravitons are customarily normalized in the low-frequency domain where the signal of the concordance paradigm is expected to peak and this is why their contribution to the temperature and polarization anisotropies of the microwave background is only described by the tensor to scalar ratio. If the consistency relations are broken, the same strategy is accomplished by introducing the tensor spectral index as a further independent parameter. When the dominant component of the spectral energy density is distributed for frequencies much larger than the aHz, the logic behind this conventional approach is much less compelling. The improved bounds in the audio band and the current data from the pulsar timing arrays in the nHz region motivate a new strategy for the absolute normalization of the cosmic background of relic gravitons. After introducing a general four-dimensional action for the analysis of the relic gravitons the new approach is illustrated in the case of conventional and unconventional inflationary models.