The danger is that a jelly of the ghostly partner of the quark could form spontaneously at any moment, changing the laws of physics of the whole Universe.
Light would stop shining, electricity would no longer work and the matter that makes up us, the Earth and the stars would disintegrate to form a different kind of matter, said Dr Allanach.
This disaster scenario caused some initial nightmares, he said. But further calculations showed that the probability of it actually happening was miniscule, even in a time as long as the age of our Universe.
The actual probability is one in 13 million squared, he said.