标题： 标量辐射与四次伽利略ons 显示英文标题

标题： Scalar Radiation with a Quartic Galileon

摘要： 伽利略标量场理论的类别包含了维因施泰因屏蔽机制，这是引力的大量红外修改理论的特征。 这类理论可以通过第五种力和新的引力辐射标量模式导致可检验的广义相对论偏离。 然而，维因施泰因机制的固有非线性限制了对同时包含三次和四次相互作用的伽利略理论进行解析描述的尝试。 为了改进这一点，我们对旋转双星源的四次伽利略模型进行了直接数值模拟，并推断出给定多极矩的功率谱。 为了抑制数值不稳定性，我们使用了低通滤波器，扩展了对三次伽利略理论的先前工作。 我们的发现表明，多极展开是明确定义且可控的。 此外，我们的结果证实，尽管是一个非线性标量，主导的伽利略辐射是四极的，并且我们在维因施泰因区域内部发现了新的标度行为。 显示英文摘要

摘要： The class of Galileon scalar fields theories encapsulate the Vainshtein screening mechanism which is characteristic of a large range of infrared modified theories of gravity. Such theories can lead to testable departures from General Relativity through fifth forces and new scalar modes of gravitational radiation. However, the inherent non-linearity of the Vainshtein mechanism has limited analytic attempts to describe Galileon theories with both cubic and quartic interactions. To improve on this, we perform direct numerical simulations of the quartic Galileon model for a rotating binary source and infer the power spectrum of given multipoles. To tame numerical instabilities we utilize a low-pass filter, extending previous work on the cubic Galileon. Our findings show that the multipole expansion is well-defined and under control. Moreover, our results confirm that despite being a non-linear scalar, the dominant Galileon radiation is quadrupole, and we find a new scaling behaviour deep inside the Vainshtein region.