Planck length or singularity?

Question

ive read that planck energy is the highest amount of energy that can fit in a sphere one planck length in diameter. if thats true doesnt that mean black holes cant really be singularity?

or is it just that if more than planck energy is concentrated into the above described region it will result in a black hole?

Answer 1

Do you really think anyone understands much of anything about physics at that scale?  We know that our theories about how gravity works will break down at some energy level short of the planck scale.  We don't know how this problem resolves itself and may never be able to probe it experimentally.  So extrapolating all the way down to the planck scale is pure speculation, at least for now.

You asked the question about black holes, but it applies equally well to the early universe.  We really aren't in a position to push back all the way to "time zero".

All that said, there are plenty of theoreticians who will engage in such speculation and make various assumptions and try to work out the consequences.  If they can come up with observable consequences, then their work can be considered scientific.