论文标题
NHz和音频带中宇宙重力的平坦光谱
Flat spectra of cosmic gravitons in the nHz and audio bands
论文作者
论文摘要
遗物重力子的光谱通常在低频结构域中进行标准化，其中一致性范式的信号有望达到峰值，这就是为什么它们对微波背景的温度和极化各向异性的贡献仅由张力量表与标量比描述。如果一致性关系被打破，则通过将张量光谱索引作为进一步的独立参数来实现相同的策略。当光谱能密度的主要成分分布在比AHZ大得多的频率的分布时，这种常规方法背后的逻辑却不那么引人注目。音频频段中的改进界限以及NHz区域的PULSAR计时阵列的当前数据激发了一种新的策略，以实现Relic Gradtons宇宙背景的绝对归一化。在引入一般的四维作用以分析遗物引力的分析中，在常规和非常规通货膨胀模型的情况下，说明了新方法。
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.
