标题： 关于Rastall = GR的更多事实 显示英文标题

标题： More on the fact that Rastall = GR

摘要： 拉斯特尔引力与广义相对论相同，只是对所谓的能量动量张量进行了简单的代数重新定义。 尽管多年前M. Visser已经非常清楚地解释了这一点，但仍然有许多论文声称两种引力方程形式之间存在巨大差异，并试图用它们来解决物理问题。 当这样做的时候，被完全忽视的任务是解释为什么守恒的能量动量量与其他用途的量彼此不同。 此外，当研究人员使用非守恒的能量密度和压强来确定声速时，这与拉斯特尔引力不一致。 我仔细解释了所有这些内容，并展示了如何构建一个变分原理以产生拉斯特尔形式的方程。 显示英文摘要

摘要： Rastall gravity is the same as General Relativity, with a simple algebraic redefinition of what is called the energy-momentum tensor. Despite it having been very clearly explained by M. Visser several years go, there are still many papers claiming big differences between the two formulations of gravitational equations and trying to use them for problems of physics. When going this way, the totally ignored task is to explain why the conserved energy-momentum quantities and the quantities used for other purposes are different from each other. Moreover, when researchers are using the non-conserved energy density and pressure for determining the sound speed, it is just inconsistent with the Rastall gravity. I carefully explain all this, and also show how one could construct a variational principle for producing equations in the Rastall form.