Analyzing Multi-Field Tunneling With Exact Bounce Solutions
  We study multi-field tunneling using exact solutions for additive potentials. We introduce a binomial potential with non-integer powers that could be considered a generalization of the $4D$ Fubini instanton potential. Using scaling arguments, we show that for multi-field potentials taller and wider barriers may still lead to a smaller bounce action. 
Aditya Aravind, Brandon S. DiNunno, Dustin Lorshbough, Sonia Paban
hep-th astro-ph.CO gr-qc