标题： 来自Reissner-Nordstrom-de Sitter黑洞的光 显示英文标题

标题： Light from Reissner-Nordstrom-de Sitter black holes

摘要： 研究了在德西特膨胀宇宙中的里斯纳-诺德斯特罗姆黑洞的光，首次推导出围绕光子球的螺旋类空测地线的形式以及承载黑洞阴影附近明显源的球体的半径。 我们由此得到了根据我们最近提出的方法给出红移和观测到的黑洞阴影的主要参数，给出了其完整的计算和结果的代数代码在计算机\cite{Comp}上。 显示英文摘要

摘要： The light from the Reissner-Nordstrom black hole in de Sitter expanding universe is studied deriving for the first time the form of the spiral null geodesics around the photon sphere and the radius of the sphere hosting the apparent sources near the black hole shadow. We obtains thus the principal parameter giving the redshift and the observed black hole shadow according to our method we proposed recently giving its complete calculations and results in an algebraic code on computer \cite{Comp}.