在Ly $α$林中搜索子字段
Searching for dilaton fields in the Ly$α$ forest
摘要：
伸缩子（和模量）耦合到普通物质的质量和耦合常数，这些量由介子场的局部值固定。此外，如果质量为$m_ϕ$的介子对宇宙暗物质密度有贡献，那么这些量在时间上以介子康普顿频率振荡。我们展示了这些振荡如何导致扩大和移动的Voigt配置文件的赖氨酸$α$森林，在与当地的暗物质密度的方式。我们进一步展示了如何层析成像方法允许通过观察遥远类星体的Ly $α$森林光谱重建的效果。然后，我们模拟了大量的类星体视线使用对数正态密度场，并预测未来的天文调查，以衡量这种影响的能力。我们发现，在超低质量范围内$10^{-32}\text{ eV}\leq m_ϕ\leq 10^{-28}\text{ eV}$即将到来的观测可以提高超过现有的限制，电子质量和精细结构常数耦合设置的第五力搜索高达五个数量级。假设超轻介子只占暗物质密度的百分之几，这与宇宙微波背景各向异性所设定的上限是一致的，那么我们的预测极限就适用了。
英文摘要：
Dilatons (and moduli) couple to the masses and coupling constants of ordinary matter, and these quantities are fixed by the local value of the dilaton field. If, in addition, the dilaton with mass $m_ϕ$ contributes to the cosmic dark matter density, then such quantities oscillate in time at the dilaton Compton frequency. We show how these oscillations lead to broadening and shifting of the Voigt profile of the Ly$α$ forest, in a manner that is correlated with the local dark matter density. We further show how tomographic methods allow the effect to be reconstructed by observing the Ly$α$ forest spectrum of distant quasars. We then simulate a large number of quasar lines of sight using the lognormal density field, and forecast the ability of future astronomical surveys to measure this effect. We find that in the ultra low mass range $10^{-32}\text{ eV}\leq m_ϕ\leq 10^{-28}\text{ eV}$ upcoming observations can improve over existing limits to the dilaton electron mass and fine structure constant couplings set by fifth force searches by up to five orders of magnitude. Our projected limits apply assuming that the ultralight dilaton makes up a few percent of the dark matter density, consistent with upper limits set by the cosmic microwave background anisotropies.
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。
