Large-scale messengers from arbitrary spin fields
  We show that nonperturbative production of arbitrary spin fields from vacuum
will accompany the generation of non-vanishing macroscopic energy-momentum
tensor correlators. This argument is based on the general causal field
formalism, which gives a manifestly covariant description of higher spin
particles without any reference to gauge redundancy. Our findings are direct
consequence of the Poincar\'e covariance and anlayticity of the Green's
functions and independent of any detailed particle physics model. Further, we
discuss the idea that any mechanism causing imbalance between the on-shell
production of left- and right-handed fields leads to a helical structure in the
energy momentum correlators and violation of the macroscopic parity symmetry.
We check our method for fields with spin $\frac{1}{2}$ and show that it
correctly reproduces previous results. However, the formalism suffers from
pathologies related to non-localities that appear for massless particles with
spin $\geq 1$ in flat space. We discuss the origin of these pathologies and the
relevance of our findings to cosmology.
