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A simulation of eternal inflation. The space–time is 2 + 1-dimensional and adding an increment in each sub-square modifies the scalar field at each step of the simulation. The bluish-white colour denotes inflating regions, while other colours denote thermalized regions. In this case, the required functions are chosen to simulate larger inflation rates at the top of the potential (around φ = 0) and deterministic slow roll near the end of inflation.
Image credit: simulation by Serge Winitzki.