- #1

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$$ M^2_p = \frac{M^3}{k} \Large[1- e^{-2k\pi r} \Large],$$

Equ. 16 in their paper:

https://arxiv.org/abs/hep-ph/9905221

With k as large as the Planck scale, the exponential will be so small and almost has no effect, which leads to (is this correct? ), as they say in page 6, ##M \approx M_p##!

So the conflict rises here, cause ##M_p## is the four dimensional effective Planck scale ##\sim 10^{18}## GeV, while ##M## is the higher 5-dimensional Planck scale assumed to be at TeV scale, so what does ##M \approx M_p## mean?

Any help is appreciated!

See also the discussion in this thread:

[The hierarchy problem][1]

[1]: https://physics.stackexchange.com/q...hy-problem?noredirect=1#comment1484638_661737