Catastrophic production of slow gravitinos

  title={Catastrophic production of slow gravitinos},
  author={Edward W. Kolb and Andrew J. Long and Evan McDonough},
  journal={Physical Review D},
We study gravitational particle production of the massive spin-$3/2$ Rarita-Schwinger field, and its close relative, the gravitino, in FRW cosmological spacetimes. For masses lighter than the value of the Hubble expansion rate after inflation, $m_{3/2} \lesssim H$, we find catastrophic gravitational particle production, wherein the number of gravitationally produced particles is divergent, caused by a transient vanishing of the helicity-1/2 gravitino sound speed. In contrast with the… 

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