标题： 非度规引力：现状报告 显示英文标题

标题： Non-metric gravity: A status report

摘要： 我们回顾了一类特定（无穷多个）四维广义协变理论的现状，这些理论传播两种自由度，并且在表述中没有直接提及度规。 广义相对论本身（在其Plebański表述中）属于这类理论，因此这些理论是修改引力的例子。 我们总结了目前对这种修改性质的理解，这些理论的可重整化特性，它们与物质场的耦合，并描述了它们的一些物理属性。 显示英文摘要

摘要： We review the status of a certain (infinite) class of four-dimensional generally covariant theories propagating two degrees of freedom that are formulated without any direct mention of the metric. General relativity itself (in its Plebanski formulation) belongs to the class, so these theories are examples of modified gravity. We summarize the current understanding of the nature of the modification, of the renormalizability properties of these theories, of their coupling to matter fields, and describe some of their physical properties.