A CSP Field Theory with Helicity Correspondence

Understand

We propose the first covariant local action describing the propagation of a single free continuous-spin degree of freedom.

• The theory is simply formulated as a gauge theory in a "vector superspace", but can also be formulated in terms of a tower of symmetric tensor gauge fields.
• When the spin invariant $\rho$ vanishes, the helicity correspondence is manifest -- familiar gauge theory actions are recovered and couplings to conserved currents can easily be introduced.
• For non-zero $\rho$, a tower of tensor currents must be present, of which only the lowest rank is exactly conserved.