I was wondering if it is possible for a single photon to form a black hole if it has a small enough wavelength.If so, what would this wavelength be? I came across this question because I am reading about loop quantum gravity, and have heard that it is 'untestable'. I know that the loops making up spacetime in loop quantum gravity are thought to have a size in the order of $10^{-35}$m, and I was wondering whether making a photon with a wavelength small enough to investigate this would form a black hole.
I am aware of the two posts here, but neither seem to really answer my question because they refer to several photons: Can a black hole be formed by radiation? and https://physics.stackexchange.com/questions/107207/photons-and-black-holes.
Thank you.
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