标题： GYOTO：一个新的广义相对论光线追踪代码 显示英文标题

标题： GYOTO: a new general relativistic ray-tracing code

摘要： 本文介绍了GYOTO，这是一个广义相对论光线追踪代码。 它的目标是计算紧致天体附近的天文天体图像以及相对论环境中大质量天体的轨迹。 该代码能够积分零测地线和类时测地线方程，不仅可以在克尔度规下进行，还可以在广义相对论的3+1形式下任何数值计算的度规下进行。 已经为各种天文目标（如移动恒星或环状吸积结构）计算了模拟图像和光谱。 底层代码是开源且免费提供的。 它易于使用，快速上手且非常模块化，因此扩展功能很容易集成。 可以通过C++插件扩展实现自定义的分析度规和天文目标，而这些扩展独立于主代码。 显示英文摘要

摘要： GYOTO, a general relativistic ray-tracing code, is presented. It aims at computing images of astronomical bodies in the vicinity of compact objects, as well as trajectories of massive bodies in relativistic environments. This code is capable of integrating the null and timelike geodesic equations not only in the Kerr metric, but also in any metric computed numerically within the 3+1 formalism of general relativity. Simulated images and spectra have been computed for a variety of astronomical targets, such as a moving star or a toroidal accretion structure. The underlying code is open source and freely available. It is user-friendly, quickly handled and very modular so that extensions are easy to integrate. Custom analytical metrics and astronomical targets can be implemented in C++ plug-in extensions independent from the main code.