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单词 Planck time
释义 Planck time
The time taken for a photon (travelling at the speed of light c) to move through a distance equal to the Planck length. It is given by
tP = v(Gℏ/c5)
, where G is the gravitational constant and is the rationalized Planck constant. The value of the Planck time is of order 10-43s. In the big-bang cosmology, up until a time tP after the initial instant, it is necessary to use a quantum theory of gravity to describe the evolution of the universe
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更新时间:2025/6/23 1:56:01