A PRIMORDIAL BLACK HOLE is a hypothetical type of black hole that is formed not by the gravitational collapse of a large star but by the extreme density of matter present during the universe's early expansion.     .....     According to the Big Bang Model, pressure and temperature were extremely high following the Big Bang. Under these conditions, simple fluctuations in the density of matter may have resulted in local regions dense enough to create black holes. Although other regions of high density would be quickly dispersed by the expansion of the universe, a large enough primordial black hole would be stable, persisting to the present.   (Wikipedia 25 Feb 2012)

In the hypothetical beginning described in Chapter Two, the Universe began its present expansion phase as an object one billion lightyears in diameter. Subsequently, in expanding, it fractured into vast numbers of primordial blackholes that varied considerably in their mass. A proportion of these blackholes stabilised into photons. Many more didn't and some of them may still be with us.