Planck acceleration (ɑₚ) is the acceleration from zero speed to the speed of the light during one Planck time. It is also derived unit in the Planck system of natural units. Planck acceleration may be stated as:
ɑₚ = c/tₚ ≈ 5.560815×10⁵¹ m/s²
The Planck acceleration is the highest acceleration conceivable in the Universe, as the speed of light is the highest possible speed and the Planck time is the shortest possible duration of any meaningful physical process. One event where the Planck acceleration was possibly reached was the Big Bang, in regard to the acceleration of the expanding Universe during the Planck epoch. Also, within a black hole, such acceleration might be possible beyond its horizon, but that is certainly unknown (and what lies beyond a horizon is beyond the reach of physical observation).
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