What would happen if you had a photon that was blueshifted enough to have a wavelength below the Planck length?

Question

I’ve read that there’s no limit on how close to the speed of light you can travel, and by doing so, photons will blueshift to infinity. So eventually you would be traveling so fast, that photons would have a wavelength of 1 Planck length. What happens if you speed up more? Can wavelength go below the Planck length, or would something else happen?

In: 1

Answer 1

The energy of a photon rises as the wavelength decreases, so when the wavelength of a photon hits 1 Planck length there is so much energy all packed into such a small space that it just turns into a black hole.