发表机构
Nagoya University（名古屋大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过LISA-TAIJI网络探测螺旋原初磁场产生的圆偏振引力波背景，计算信噪比并预测可约束螺旋功率比，为未来观测提供判据。
AI 中文摘要
原初磁场（PMFs）预计是通过其各向异性应力产生随机引力波背景（SGWB）的宇宙学候选者。特别是，如果在PMFs的产生过程中存在宇称破缺，它会在PMFs中诱导螺旋分量，导致各向同性SGWB中的圆偏振。在本研究中，我们从现象学角度考虑宇称破缺的暴胀磁发生，并针对几种假设的螺旋PMFs功率谱计算SGWB的强度和圆偏振。利用LISA-TAIJI网络的计划灵敏度，我们计算信噪比（SNR）并进行Fisher预测，以评估约束螺旋PMFs参数的可行性。我们得出结论，在PMF强度为$\mathcal{B} \gtrsim 10~\mathrm{nG}$（$50~\mathrm{nG}$）的情况下，对于δ函数型（尺度不变型）PMF谱，可以估计螺旋与非螺旋功率比~$r_H$，且$\mathrm{SNR}^{V}>2$。我们的结果为未来在小尺度$k_\mathrm{LISA} \approx 10^{12}~\mathrm{Mpc}^{-1}$上对螺旋PMFs的观测限制提供了有用的判据。
英文摘要
Primordial magnetic fields (PMFs) are anticipated to be a cosmological candidate for generating a stochastic gravitational wave background (SGWB) through their anisotropic stress. In particular, if parity violation is present in the production of PMFs, it can induce a helical component in the PMFs, leading to circular polarization in the isotropic SGWB. In this study, we phenomenologically consider parity-violating inflationary magnetogenesis and compute the intensity and circular polarization of the SGWB for several assumed power spectra of helical PMFs. Using the planned sensitivity of the LISA-TAIJI network, we calculate the signal-to-noise ratio (SNR) and perform a Fisher forecast to assess the feasibility of constraining the parameters of helical PMFs. We conclude that it is possible to estimate the helical-to-non-helical power ratio~$r_H$ with $\mathrm{SNR}^{V}>2$ if the PMF strength is $\mathcal{B} \gtrsim 10~\mathrm{nG}$ ($50~\mathrm{nG}$) in the case of the delta-function-type (scale-invariant-type) PMF spectrum. Our results offer a useful criterion that indicates the future observational limit on helical PMFs at the small scale $k_\mathrm{LISA} \approx 10^{12}~\mathrm{Mpc}^{-1}$.
Comments25 pages, 5 figures
