Shadow, First of His Name 
Cappelluti and Magaraggia are convinced that what LIGO detected could not be anything but the signature of a primordial black hole born in the early universe’s high-density environment long before stars even formed. And they are hopeful that their research will prove it from direct potential discovery of a subsolar black hole by LIGO, which late last year detected an unusual signal of a gravitational wave, an invisible ripple in the fabric of spacetime caused by violent processes such as the collision of two black holes.
From theoretical to hypothetical to breakthrough and proving it - research is essential; evidence matters:
We attempted to estimate how many primordial black holes may exist in the universe and how many of them LIGO should be able to detect, and our results are encouraging. We predict that subsolar black holes like the one LIGO may have observed should indeed be rare, consistent with how infrequently such events have been seen so far.
The most plausible explanation for the LIGO signal, which lacks any conventional astrophysical explanation, is the detection of a primordial black hole. And our research indicates that these primordial black holes could account for a significant portion, if not all, of dark matter.
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