Schwarzschild-de Sitter黑洞附近的极端引力透镜
Extreme gravitational lensing in vicinity of Schwarzschild-de Sitter black holes
摘要：
我们已经开发了一个现实的，完全广义相对论的计算机代码来模拟光学投影在一个强大的，球对称的引力场。将Schwarzschild黑洞附近观测者光学投影的标准理论分析推广到具有排斥性宇宙学常数的黑洞时空，即Schwarzschild-de Sitter时空.研究了静态观测者和从静态半径径向自由下落的观测者的宇宙学常数的影响。模拟包括引力透镜效应、多重成像、多普勒和引力频移以及强度放大等。该代码为静态观察者生成天空的图像，为径向自由落体观察者生成变化的天空的电影模拟。并行编程技术的应用，以获得一个高性能和快速运行的BHC模拟代码。
英文摘要：
We have developed a realistic, fully general relativistic computer code to simulate optical projection in a strong, spherically symmetric gravitational field. The standard theoretical analysis of optical projection for an observer in the vicinity of a Schwarzschild black hole is extended to black hole spacetimes with a repulsive cosmological constant, i.e, Schwarzschild-de Sitter spacetimes. Influence of the cosmological constant is investigated for static observers and observers radially free-falling from the static radius. Simulations include effects of the gravitational lensing, multiple images, Doppler and gravitational frequency shift, as well as the intensity amplification. The code generates images of the sky for the static observer and a movie simulations of the changing sky for the radially free-falling observer. Techniques of parallel programming are applied to get a high performance and a fast run of the BHC simulation code.
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