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arXiv 2406.17853hep-phastro-ph.HE
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利用银河系磁场中引力波背景转化为光子来约束引力波背景

Constraining gravitational-wave backgrounds from conversions into photons in the Galactic magnetic field

Alessandro Lella, Francesca Calore, Pierluca Carenza, Alessandro Mirizzi

AI总结:

本文利用银河系规则与湍动磁场中的引力子—光子转化及宇宙光子背景观测,对 $10^9-10^{26}$ Hz 引力波背景应变设定比既有界限强 $1-2$ 个数量级的约束。

摘要:

高频引力波($f \gtrsim 1$ MHz)可能为奇异物理的存在提供独特信号。由于当前和未来的引力波实验都缺乏对这些频率的敏感性,因此需要采用不同的间接技术。值得注意的是,最有前景的技术之一是磁场中的引力子—光子转化。在本工作中,我们聚焦于银河系磁场内引力波背景向光子的转化,并同时考虑了规则分量和湍动分量的最新模型。我们讨论了引力子到光子的转化如何在频率 $f\sim10^{9}-10^{26}\\,\mathrm{Hz}$ 范围内的宇宙光子背景谱中留下印记;在该频率范围内,观测到的光子通量已被天体物理发射模型广泛解释。因此,由于不存在任何由引力子—光子转化诱导的漫射光子通量的显著证据,我们得以对引力波应变 $h_c$ 设定严格约束,在所考虑的整个频率范围内将当前天体物理界限加强约 $1-2$ 个数量级。

英文摘要:

High-frequency gravitational waves ($f \gtrsim 1$ MHz) may provide a unique signature for the existence of exotic physics. The lack of current and future gravitational-wave experiments sensitive at those frequencies leads to the need of employing different indirect techniques. Notably, one of the most promising one is constituted by graviton-photon conversions in magnetic fields. In this work, we focus on conversions of a gravitational-wave background into photons inside the Milky-Way magnetic field, taking into account the state-of-the-art models for both regular and turbulent components. We discuss how graviton-to-photon conversions may lead to imprints in the cosmic photon background spectrum in the range of frequencies $f\sim10^{9}-10^{26}\,$Hz, where the observed photon flux is widely explained by astrophysics emission models. Hence, the absence of any significant evidence for a diffuse photon flux induced by graviton-photon conversions allows us to set stringent constraints on the gravitational-wave strain $h_c$, strengthening current astrophysical bounds by $\sim1-2$ orders of magnitude in the whole range of frequencies considered.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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