The time of greatest expansion of the universe right after the big bang is called*1 pointThe bangsecondPlanktimeOrigintimeBigBangtime

The correct term for the time of greatest expansion of the universe right after the Big Bang is Planck time.

Planck time is a fundamental time scale in physics, which is approximately $5.39 \times 10^{-44}$ seconds. It represents the time it would take for light to travel one Planck length, a fundamental unit of length. The significance of the Planck time arises because, at this instant, the conditions of the universe were so extreme that current physical theories, including general relativity and quantum mechanics, merge and where the effects of quantum gravity become significant.