Testing the gravitational weak equivalence principle in the standard model extension with binary pulsars
Testing the gravitational weak equivalence principle in the standard model extension with binary pulsars
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DOI：
10.1103/physrevd.99.084017
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发表时间：
2019-03
影响因子：
5
通讯作者：
Lijing Shao;Q. Bailey
中科院分区：
文献类型：
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作者：
Lijing Shao;Q. Bailey
标准模型扩展提供了一个框架，系统地研究可能违反洛伦兹对称性。关于重力，广泛研究了线性化的版本。在这里，我们铸造的第一组实验边界的非线性项的场方程从各向异性立方曲率耦合。这些项为自引力物体引入了依赖于物体的加速度，从而违反了引力弱等效原理（GWEP）。新的现象，在线性化的引力中是不存在的，仍然没有实验探索。我们用脉冲星定时的精确双星轨道测量来约束它们，其中中子星的高密度和大紧凑性对测试至关重要。这是第一个研究，寻求GWEP违反信号在一个完全各向异性的框架与洛伦兹破坏。
The Standard-Model Extension provides a framework to systematically investigate possible violation of the Lorentz symmetry. Concerning gravity, the linearized version was extensively examined. We here cast the first set of experimental bounds on the nonlinear terms in the field equation from the anisotropic cubic curvature couplings. These terms introduce body-dependent accelerations for self-gravitating objects, thus violating the gravitational weak equivalence principle (GWEP). Novel phenomena, that are absent in the linearized gravity, remain experimentally unexplored. We constrain them with precise binary-orbit measurements from pulsar timing, wherein the high density and large compactness of neutron stars are crucial for the test. It is the first study that seeks GWEP-violating signals in a fully anisotropic framework with Lorentz violation.