Some scientists argue that Primordial Black Holes existed since the dawn of time.Obaidur Rahman
A Primordial Black Hole (PBH) is a hypothetical black hole that may have formed in the early, highly compressed stages of the Universe immediately after the big bang. According to experts, during the first few moments after the big bang, the pressure and the temperature of the early Universe were very intense. In that condition, simple fluctuation in the density of matters may have resulted in local regions to get dense enough to create black holes. It is thought that due to the expansion of the Universe, most regions of high density quickly dispersed. However, primordial black hole would still be stable and exist till date.
It is believed that if scientists are able to determine how many primordial black holes are there, we would learn a great deal about the early stages of the Universe. Black holes with masses of more than 1000 million tons could be detected only by their gravitational influence on other visible matter or on the expansion of the Universe. There may be PBHs with a much smaller mass created due to collapse irregularities during the earlier stages of the Universe. Scientists believe those would have a much higher temperature and likely to be emitting radiation at a much higher rate. Since they are not formed by stellar core collapse like other black holes, PBH can be of any size. As gravity would draw a PBH towards any matter, they are likely to be very common in and around galaxies. Gamma Ray Background indicates that there cannot be more than 300 PBH per cubic light-year on average.
One crucial way to detect primordial black holes is through watching out for ripples on the surface of stars because if the PBH passes through a star, its density would cause observable vibrations. This means that PBH are in fact much smaller than the normal black holes and hence would not swallow up a star and all of its energy. Their collision with stars would cause noticeable vibrations on the surfaces of the star. Scientists believe they may be able to spot evidence of the mysterious dark matter by watching out for ripples. It has long been proposed that PBH could be a candidate for the dark matter and the ripples could provide observable proof of dark matter, which is believed to make up for 80% of all matters in the Universe!
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