arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.08417gr-qc
收藏

来自双折射物质动力学的引力辐射

Gravitational radiation from birefringent matter dynamics

Nils Alex

摘要:

本文研究了具有真空双折射的物质场所处的时空的二阶引力动力学。推导遵循协变建设性引力程序的微扰变体,确保引力的同构不变性和物质理论与引力的因果相容性。随后对这个理论的时空分裂揭示了非物理人为因素的存在,这些人为因素通过对引力常量施加限制而得到治愈,将它们的数量从10个减少到7个。在这个扇形范围内,我们导出了作圆周运动的双星系统的引力辐射。该系统发出无质量波,对应于爱因斯坦引力所预测的辐射,但也有质量波,只在一定的角频率阈值以上产生,爱因斯坦引力是未知的。一个引力波探测器模拟为球体的自由落体测试质量显示定量和定性的新行为的影响下,这种辐射。其结果是从第一性原理预测引力自耦合,证明了协变建设性引力的预测能力的修改重力研究,特别是在引力波天文学的时代。

英文摘要:

We present the second-order gravitational dynamics for a spacetime inhabited by matter fields which feature vacuum birefringence. The derivation follows a perturbative variant of the covariant constructive gravity program, ensuring diffeomorphism invariance of gravity and causal compatibility of matter theory and gravity. A subsequent spatio-temporal split of this theory reveals the presence of unphysical artifacts, which are cured by imposing constraints on the gravitational constants, reducing their number from ten to seven. Within this sector, we derive the gravitational radiation emitted by a binary system in circular motion. The system emits massless waves which correspond to the radiation predicted by Einstein gravity, but also massive waves, which are generated only above a certain angular frequency threshold and are unknown to Einstein gravity. A gravitational-wave detector modeled as sphere of freely falling test masses shows quantitatively and qualitatively new behavior under the influence of this radiation. The result is a prediction of gravitational self-coupling from first principles, demonstrating the predictive power of covariant constructive gravity for modified gravity research, especially in the era of gravitational-wave astronomy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑