Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. If an operator is not simply expressed as a product, but as a function of another operator, we must first perform Taylor expansion of this function. This is the case of the Wilson loop that is defined as a path-ordered exponential; this guarantees that the Wilson loop encodes the h ...Täielik kirjeldus
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. If an operator is not simply expressed as a product, but as a function of another operator, we must first perform Taylor expansion of this function. This is the case of the Wilson loop that is defined as a path-ordered exponential; this guarantees that the Wilson loop encodes the holonomy of the gauge connection. The parameter ¿ that determines the ordering is a parameter describing the contour, and because the contour is closed, the Wilson loop must be defined as a trace in order to become gauge-invariant