2 items with this tag.
Tensor networks tensor-networks tensors contractions graphs gauge-invariance Motivation When we use the traditional index notation for manipulating tensors, we are essentially keeping track of the following information: The invariant objects concerned, or tensors, which are labelled using letters.
Gauge invariance gauge-invariance gauge-fields covariant-derivatives Gauge fields A tensor field is a system with infinite degrees of freedom along a countable number of orientations.