A manifestly gauge-invariant approach to quantum theories of gauge fields
A manifestly gauge-invariant approach to quantum theories of gauge fields
In gauge theories, physical histories are represented by space-time connections modulo gauge transformations. The space of histories is thus intrinsically non-linear. The standard framework of constructive quantum field theory has to be extended to face these kinematical non-linearities squarely. We first present a pedagogical account of this problem and then …