论文标题
宇宙的曲子：血浆在强场重力测试中的作用
The tune of the universe: the role of plasma in tests of strong-field gravity
论文作者
论文摘要
引力波天文学，以及精确的脉冲星时间和长基线干涉法，正在改变我们对具有天体物理观察的基本物理学测试的能力。其中一些测试基于电磁探针或电动物体，并假设一个空的宇宙。但是，宇宙充满了血浆，血浆是一种稀释培养基，可防止低频，小振幅电磁波的传播。我们表明，等离子体阻碍了我们执行一些强场重力测试的能力，特别是：（i）〜非线性血浆效应极大地淬灭等离子体驱动的超级助力不稳定性； （ii）〜电磁发射对带电黑洞二进制的灵感的贡献得到了强烈抑制； （iii）〜电磁驱动的二次模式，尽管存在于带电的黑洞范围中，但在重力波圈式信号中却兴奋地振幅可忽略不计。最后两个效果也有意义，因为在真空中传播的大规模领域也可能危及对包含大量自由度的重力理论的检验。
Gravitational-wave astronomy, together with precise pulsar timing and long baseline interferometry, is changing our ability to perform tests of fundamental physics with astrophysical observations. Some of these tests are based on electromagnetic probes or electrically charged bodies, and assume an empty universe. However, the cosmos is filled with plasma, a dilute medium which prevents the propagation of low-frequency, small-amplitude electromagnetic waves. We show that the plasma hinders our ability to perform some strong-field gravity tests, in particular: (i)~nonlinear plasma effects dramatically quench plasma-driven superradiant instabilities; (ii)~the contribution of electromagnetic emission to the inspiral of charged black hole binaries is strongly suppressed; (iii)~electromagnetic-driven secondary modes, although present in the spectrum of charged black holes, are excited to negligible amplitude in the gravitational-wave ringdown signal. The last two effects are relevant also in the case of massive fields that propagate in vacuum and can jeopardize tests of modified theories of gravity containing massive degrees of freedom.
