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arXiv 0909.3328gr-qcastro-ph.GAastro-ph.HEhep-th
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引力波天体物理的基本理论偏差与参数化后爱因斯坦框架

Fundamental Theoretical Bias in Gravitational Wave Astrophysics and the Parameterized Post-Einsteinian Framework

Nicolas Yunes, Frans Pretorius

摘要:

我们把引力波天体物理学中的基本偏差概念看作是在整个波的产生和传播过程中,广义相对论是正确的引力理论的假设。这样的假设在弱场中是有效的,正如精密实验和观测所证实的那样,但在缺乏实验的动力学强场区,它不一定成立。基本偏差会在信号的检测和参数估计中引起系统误差,这会通过对源事件率和种群的不正确推断而导致对宇宙的错误表征。我们提出了一种补救措施,通过引入参数化后爱因斯坦框架,其中包括通过列入后爱因斯坦参数的波形模板的增强。这些参数表面上是为了在广义相对论和其他动机良好的引力理论中构建的模板之间进行插值,也包括遵循合理理论原则的外推,例如与守恒定律和对称性的一致性。作为一个例子,我们构造参数化的后爱因斯坦模板的二进制聚结等质量,非自旋紧凑的对象在一个准圆形的inspiral。参数化的后爱因斯坦框架应该允许匹配的过滤数据选择一组特定的后爱因斯坦参数,而无需先验地假设前者的有效性,从而验证广义相对论或指出可能的动力学强场偏差。

英文摘要:

We consider the concept of fundamental bias in gravitational wave astrophysics as the assumption that general relativity is the correct theory of gravity during the entire wave-generation and propagation regime. Such an assumption is valid in the weak field, as verified by precision experiments and observations, but it need not hold in the dynamical strong-field regime where tests are lacking. Fundamental bias can cause systematic errors in the detection and parameter estimation of signals, which can lead to a mischaracterization of the universe through incorrect inferences about source event rates and populations. We propose a remedy through the introduction of the parameterized post-Einsteinian framework, which consists of the enhancement of waveform templates via the inclusion of post-Einsteinian parameters. These parameters would ostensibly be designed to interpolate between templates constructed in general relativity and well-motivated alternative theories of gravity, and also include extrapolations that follow sound theoretical principles, such as consistency with conservation laws and symmetries. As an example, we construct parameterized post-Einsteinian templates for the binary coalescence of equal-mass, non-spinning compact objects in a quasi-circular inspiral. The parametrized post-Einsteinian framework should allow matched filtered data to select a specific set of post-Einsteinian parameters without a priori assuming the validity of the former, thus either verifying general relativity or pointing to possible dynamical strong-field deviations.

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