Bounds on the Horndeski gauge-gravity coupling
Bounds on the Horndeski gauge-gravity coupling
复制标题
DOI：
10.1088/1475-7516/2020/05/013
复制
发表时间：
2020-02
影响因子：
6.4
通讯作者：
A. Allahyari;M. Gorji;S. Mukohyama
中科院分区：
文献类型：
--
作者：
A. Allahyari;M. Gorji;S. Mukohyama
Horndeski规范-重力耦合是重力和规范玻色子之间最主要的非最小相互作用，它保留了粒子物理和广义相对论标准模型的所有对称性和物理自由度的数量。本文研究了非极小相互作用在天文学和宇宙学中的作用，得到了相关的无量纲耦合常数λ的上界。通过对压缩天体规范玻色子运动方程的修正，我们发现黑洞阴影、中子星和白矮星的规范玻色子的上界分别为|λ| > 1088、|λ| > 1070和|λ| > 1081。由中子星推导出的界|λ| > 1070是最强的，比已知的界|λ| > 1070提高了20个数量级。另一方面，这一项对引力泊松方程修正的影响导致一个较弱的界|λ| > 1098。从引力波的传播中，我们还发现|λ| > 10119，它甚至更弱。
The Horndeski gauge-gravity coupling is the leading non-minimal interaction between gravity and gauge bosons, and it preserves all the symmetries and the number of physical degrees of freedom of the standard model of particle physics and general relativity. In this paper we study the effects of the non-minimal interaction in astronomy and cosmology, and obtain upper bounds on the associated dimensionless coupling constant λ. From the modification of equations of motion of gauge bosons applied to compact astronomical objects, we find upper bounds |λ| ≲ 1088, |λ| ≲ 1070 and |λ| ≲ 1081 from a black hole shadow, neutron stars and white dwarfs, respectively. The bound |λ| ≲ 1070 that is deduced from neutron stars is the strongest and provides twenty orders of magnitude improvement of the previously known best bound on this parameter. On the other hand, the effects of this term on modification of the gravitational Poisson equation lead to a weaker bound |λ| ≲ 1098. From the propagation of gravitational waves we also find |λ| ≲ 10119, which is even weaker.