The torsional Chern-Simons term in a non-relativistic Schrodinger-invariant action reproduces, in form, the 1+1 Lifshitz Weyl anomaly on the boundary, though its coefficient is not fixed.
Revisiting non-relativistic limits
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We show that the full spurionic symmetry of Galilean-invariant field theories can be deduced when those theories are the limits of relativistic parents. Under the limit, the non-relativistic daughter couples to Newton-Cartan geometry together with all of the symmetries advocated in previous work, including the recently revived Milne boosts. Our limit is a covariant version of the usual one, where we start with a gapped relativistic theory with a conserved charge, turn on a chemical potential equal to the rest mass of the lightest charged state, and then zoom in to the low energy sector. This procedure gives a simple physical interpretation for the Milne boosts. Our methods even apply when there is a magnetic moment, which is known to modify the non-relativistic symmetry transformations. We focus on two examples, taking the non-relativistic limits of scalar field theory and hydrodynamics.
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A (1+1)-dimensional Lifshitz Weyl Anomaly From a Schr$\mathrm{\ddot{o}}$dinger-invariant Non-relativistic Chern-Simons Action
The torsional Chern-Simons term in a non-relativistic Schrodinger-invariant action reproduces, in form, the 1+1 Lifshitz Weyl anomaly on the boundary, though its coefficient is not fixed.