当前位置: X-MOL 学术Classical Quant. Grav. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Initial data and first evolutions of dust clouds in bimetric relativity
Classical and Quantum Gravity ( IF 3.5 ) Pub Date : 2020-07-28 , DOI: 10.1088/1361-6382/ab87d8
Mikica Kocic , Francesco Torsello , Marcus Högås , Edvard Mörtsell

We present a method for solving the constraint equations in the Hassan–Rosen bimetric theory to determine the initial data for the gravitational collapse of spherically symmetric dust. The setup leads to equations similar to those for a polytropic fluid in general relativity, here called Lane–Emden-like equations. Using a numerical code which solves the evolution equations in the standard 3 + 1 form, we also obtain a short-term development of the initial data for these bimetric spherical clouds. The evolution highlights some important features of the bimetric theory such as the interwoven and oscillating null cones representing the essential nonbidiagonality in the dynamics of the two metrics. The simulations are in the strong-field regime and show that, at least at an early stage, if the bimetric initial data are close to those for general relativity, the bimetric evolution stays close to the evolution in general relativity as well, and with no instabilities, albeit with small ...

中文翻译:

相对论中尘埃云的初始数据和初次演化

我们提出了一种求解哈桑-罗森(Hassan-Rosen)双度量理论中的约束方程式的方法,以确定球形对称粉尘的重力塌陷的初始数据。该设置产生的方程与广义相对论中的多变流体的方程相似,在这里称为Lane-Emden-like方程。使用数字代码以标准3 +1形式求解演化方程,我们还获得了这些双度量球形云的初始数据的短期开发。演变过程突出了双度量理论的一些重要特征,例如交织和振荡的零锥表示两个度量动力学中的基本非双对角性。模拟是在强磁场条件下进行的,表明至少在早期阶段,
更新日期:2020-07-29
down
wechat
bug