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How many photons in one Planck volume would it take to form a tiny black hole?

A photon doesn't have mass but it does have energy, $1.0101 \times 10^{-37}$ Joule for red $650$ nm wavelength light if I'm correct. A photon is a point-like boson so an infinite number of photons can fit into any given area.

So more photons is equal to more energy which would bend space-time even more till they themselves wouldn't be able to escape from their own bend in space-time.

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Related: physics.stackexchange.com/q/14064/2451 and links therein. –  Qmechanic Oct 20 '14 at 20:24

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