论文标题
纳米格拉夫结果对通货膨胀的影响
Implications of the NANOGrav results for inflation
论文作者
论文摘要
Nanograv Pulsar定时阵列实验报告了影响Pulsar定时残差的随机普通谱过程的证据，该过程可能将其12。5年数据集中的数据集中解释为首次检测随机重力波浪背景（SGWB）。我检查了纳米格拉夫信号是否可以通过通货膨胀SGWB来解释，重点是对张量光谱指数$ n_t $和张量与量表$ r $ $ r $的影响。在符合Bicep2/Keck Array和Planck的$ R $上的上限时，解释了Nanograv，需要$ R \ GTRSIM {\ cal O}（10^{ - 6}）$，以及极其蓝色的张量频谱，$ 0.7 \ billssim n_t n_t \ simsim n_t \ sieldsim simsim。 After discussing models which can realize such a blue spectrum, I show that this region of parameter space can be brought in agreement with Big Bang Nucleosynthesis constraints for a sufficiently low reheating scale, $T_{\rm rh} \lesssim 100\,{\rm GeV}-1\,{\rm TeV}$.因此，对于原始张量光谱假设幂律参数化的重要警告，因此不排除对纳米格拉夫信号的通货膨胀解释。
The NANOGrav pulsar timing array experiment reported evidence for a stochastic common-spectrum process affecting pulsar timing residuals in its 12.5-year dataset, which might be interpreted as the first detection of a stochastic gravitational wave background (SGWB). I examine whether the NANOGrav signal might be explained by an inflationary SGWB, focusing on the implications for the tensor spectral index $n_T$ and the tensor-to-scalar ratio $r$. Explaining NANOGrav while complying with upper limits on $r$ from BICEP2/Keck Array and Planck requires $r \gtrsim {\cal O}(10^{-6})$ in conjunction with an extremely blue tensor spectrum, $0.7 \lesssim n_T \lesssim 1.3$. After discussing models which can realize such a blue spectrum, I show that this region of parameter space can be brought in agreement with Big Bang Nucleosynthesis constraints for a sufficiently low reheating scale, $T_{\rm rh} \lesssim 100\,{\rm GeV}-1\,{\rm TeV}$. With the important caveat of having assumed a power-law parametrization for the primordial tensor spectrum, an inflationary interpretation of the NANOGrav signal is therefore not excluded.
