In 1981 Dimopoulous, Raby and Wilczek, considering SUSY GUT, remark that(adsbygoogle = window.adsbygoogle || []).push({}); In the ordinary theory [itex]M \approx 10^{15} GeV[/itex] and ... so the supersymmetric [itex]M \approx 10^{18} GeV[/itex]. This is the same ordeor of magnitude as the Planck mass, hinting perhaps a larger unification including gravity as well

Before in 1974 Georgi, Quinn and Weinberg already were suggesting this scent:It is intriguing that we are let to contemplate elementary particle masses as high as 2 10E17 GeV, or about the same order of magnitude as the Planck mass, G^1/2=1.2206E19 GeV. Perhaps gravitation has something do to with the superstrong spontaneus symmetry breaking, or perhaps the spontaneus breakdown of the simple simple gauge group has something to do with setting the scale of the gravitational interaction.

In fact the current estimates for the SUSY GUT scale are still, I believe, at about a close factor, 1/400, of the Planck scale. It seems that any theory of quantum gravity should reflect about it. Do they?

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# Planck and GUT scales

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