In the comments the answers by JaneHM basically covers it.

Now you are heading back to here

http://profmattstrassler.com/articles-and-posts/particle-physics-basics/the-hierarchy-problem/
Quote:
The mass of the smallest possible black hole defines what is known as the Planck Mass.

To understand why review black hole evaporation
http://en.wikipedia.org/wiki/Hawking_radiation

Especially read the section "Black hole evaporation has several significant consequences"

The short form of the answer I can make is the process is not going to be nice and simple (the point I think Lubos was making) OR gravity is not a quantum field.

I like Lubos am open to other ideas but I can't see many choices here you really need a sharp cutoff for that answer to fly.

Last edited by Orac; 09/23/14 02:41 PM.
I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.