Planck scale
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The notion of Planck scale[1] is a unit of energy at around GeV, and it is essential to all of physics and even meta physics. According to wikipedia, one may found the statement below:
At this scale, present descriptions and theories of sub-atomic particle interactions in terms of quantum field theory break down and become inadequate, due to the impact of the apparent non-renormalizability of gravity within current theories.
It is also a kind of invariant that can be used to assess the boundaries or limits of causal relations.