从动力学共形Horava理论导出的爱因斯坦四极公式
Einstein's quadrupole formula from the kinetic-conformal Horava theory
摘要：
我们分析了辐射和非辐射的线性变量在一个引力理论的家庭内的不可投射的Horava理论，Horava理论在动力学共形点。在这个公式中没有额外的模式，该理论与广义相对论共享相同数量的自由度。我们所考虑的大距离有效作用量，在渐近平坦边界条件下，可以给出广义协变形式，在以太向量上超曲面正交条件下，可以给出爱因斯坦-以太理论。在线性化理论中，我们发现只有横截无迹张量模服从源波动方程，就像在广义相对论中一样。其余的变量都是非辐射的。结果在线性化理论的水平上是与规范无关的。对于弱源的情况，如果适当地确定某些耦合常数，我们发现远区的主导模正是爱因斯坦的广义相对论四极公式。在这个公式中既没有单极子也没有偶极子，这与动力学共形点之外的不可投射的Horava理论不同。我们还讨论了由洛伦兹破坏理论的观测界所引起的对理论的一些限制。
英文摘要：
We analyze the radiative and nonradiative linearized variables in a gravity theory within the familiy of the nonprojectable Horava theories, the Horava theory at the kinetic-conformal point. There is no extra mode in this formulation, the theory shares the same number of degrees of freedom with general relativity. The large-distance effective action, which is the one we consider, can be given in a generally-covariant form under asymptotically flat boundary conditions, the Einstein-aether theory under the condition of hypersurface orthogonality on the aether vector. In the linearized theory we find that only the transverse-traceless tensorial modes obey a sourced wave equation, as in general relativity. The rest of variables are nonradiative. The result is gauge-independent at the level of the linearized theory. For the case of a weak source, we find that the leading mode in the far zone is exactly Einstein's quadrupole formula of general relativity, if some coupling constants are properly identified. There are no monopoles nor dipoles in this formulation, in distinction to the nonprojectable Horava theory outside the kinetic-conformal point. We also discuss some constraints on the theory arising from the observational bounds on Lorentz-violating theories.
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