The Equivalence Principle and Gauge Theories of Gravity
Hao Liuxiang · Studies in the History of Natural Sciences · 2011
The three types of gauge theories of gravity(GTGs) based on the equivalence principle are analyzed historically.The confusion about the definition of translational potentials is clarified,and the distinction between YM theories and GTGs is drawn.Specifically,the gauge potential in YM theory is Ehresmann connection on the principle bundles,while the gauge potential in GTGs is Cartan connection in Cartan geometry.