标题： 共形瑞奇和物质共线性对于两种完美流体 显示英文标题

标题： Conformal Ricci and Matter Collineations for Two Perfect Fluids

摘要： 共形Ricci和共形物质共线性在广义相对论中两种完美流体组合的情况被研究。 我们通过引入这类流体的运动学和动力学性质，并利用爱因斯坦场方程，研究了类时和类空共形Ricci和物质共线性的存在性。 一些关于共形共线性的最新研究被扩展，发现了新的结果。 值得一提的是，我们将所有先前的结果作为特殊情况恢复出来了。 显示英文摘要

摘要： Conformal Ricci and conformal matter collineations for the combination of two perfect fluids in General Relativity are investigated. We study the existence of timelike and spacelike conformal Ricci and matter collineations by introducing the kinematical and dynamical properties of such fluids and using the Einstein field equations. Some recent studies on conformal collineations are extended and new results are found. It is worth mentioning that we recover all the previous results a special cases.