arXiv 1601.041452016-01-16astro-ph.HEgr-qchep-phhep-th

利用TeV Blazar检验爱因斯坦等效原理

Tests of the Einstein Equivalence Principle using TeV Blazars

Jun-Jie Wei, Jie-Shuang Wang, He Gao, Xue-Feng Wu

备注：: 4 pages, accepted for publication in the Astrophysical Journal Letters
DOI：: 10.3847/2041-8205/818/1/L2

摘要：

观测到的TeV耀变体不同能带之间的时间延迟为检验爱因斯坦等效原理（EEP）提供了一种有趣的新方法。如果整个时间延迟被银河系的引力场控制，则可以估计出EEP的保守上限。在这里，我们表明，严格限制的差异的参数化后牛顿参数$γ$值是$γ_{\rm TeV}-γ_{\rm keV}<3.86\times10^{-3}$为Mrk 421和$γ_{\rm TeV}-γ_{\rm keV}<4.43\times10^{-3}$为Mrk 501，同时扩大范围的测试EEP能量范围的TeV-keV范围的第一次。在PKS 2155-304的0.2- 0.8 TeV和$>0.8$ TeV光变曲线的小时间滞后下，尽管能量差为$\sim$ TeV的量级，但可以实现对$γ$差为$\sim10^{-6}$的更严格的限制。此外，我们可以结合这些限制的能量依赖性的$γ$的绝对$γ$值$γ-1\sim0.3\%$从光偏转测量在光学（eV）带的约束，并得出结论，这个绝对约束$γ$可以从光学扩展到TeV的能量。

英文摘要：

The observed time delays between different energy bands from TeV blazars provide a new interesting way of testing the Einstein Equivalence Principle (EEP). If the whole time delay is assumed to be dominated by the gravitational field of the Milky Way, the conservative upper limit on the EEP can be estimated. Here we show that the strict limits on the differences of the parameterized post-Newtonian parameter $γ$ values are $γ_{\rm TeV}-γ_{\rm keV}<3.86\times10^{-3}$ for Mrk 421 and $γ_{\rm TeV}-γ_{\rm keV}<4.43\times10^{-3}$ for Mrk 501, while expanding the scope of the tested EEP energy range out to the TeV--keV range for the first time. With the small time lag from the 0.2--0.8 TeV and $>0.8$ TeV light curves of PKS 2155-304, a much more severe constraint on $γ$ differences of $\sim10^{-6}$ can be achieved, although the energy difference is of order of $\sim$ TeV. Furthermore, we can combine these limits on the energy dependence of $γ$ with the bound on the absolute $γ$ value $γ-1\sim0.3\%$ from light deflection measurements at the optical (eV) bands, and conclude that this absolute bound on $γ$ can be extended from optical to TeV energies.

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