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I have read this question:

Why do quantum effects of gravity become important at the Planck scale?

What does quantum gravity look like at or beyond the Planck scale?

Gravity and Planck scale

What is the relationship between a gravitational wave and a graviton?

And the answer where it says:

at very small distances of the order of the Planck length (∼10−35m), gravity becomes very strong

None of these questions says whether gravity is stronger or not at that scale.

Question:

  1. Is it correct that gravity becomes strong at the Planck scale?
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    $\begingroup$ The short answer is nobody knows, because we don't have any experimental data even close to that scale. Was there a particular theory of quantum gravity that you wanted this question answered with? $\endgroup$ – probably_someone Jul 3 '18 at 1:21
  • $\begingroup$ I only know string theory. Is there anything in string theory that says gravity becomes stronger at the Planck scale? $\endgroup$ – Árpád Szendrei Jul 3 '18 at 1:30

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