Lattice Simulation of Multi-Stream Inflation
  We present the first lattice simulation to investigate the nature of
multi-stream inflation. The simulation confirms the physical picture of
multi-stream inflation, and with new findings in parameter space and field
behaviors. Our simulation shows that gradient energy plays a significant role
in multi-stream inflation. For a double field potential with a shifted Gaussian
barrier, bifurcation probability is controlled by the shift distance with an
error function relation. The bubbles created by bifurcation tend to be more
spherical as bifurcation probability decreases. Also, the bifurcation is more
likely to introduce oscillations of field values inside the bubbles than
outside.
