The origin of the universe and the nature of what existed before the Big Bang are still active areas of scientific inquiry and speculation. While there are various theories and hypotheses proposed, our current understanding of physics and cosmology is limited when it comes to explaining what occurred before the Big Bang.
Black holes, as we understand them within the framework of general relativity, are regions of extremely dense matter that result from the collapse of massive stars. They have a well-defined boundary called the event horizon, beyond which nothing, including light, can escape their gravitational pull.
However, connecting black holes to the concept of what existed before the Big Bang is a highly speculative proposition. The Big Bang theory describes the expansion of the universe from a highly compressed and incredibly hot state. It is not currently known if black holes played a role in the pre-Big Bang phase or if they are connected to a cyclical process of the universe.
It's worth noting that our understanding of physics breaks down at the very early moments of the universe, and we require a more complete theory that reconciles general relativity with quantum mechanics to provide a comprehensive explanation of the origin of the universe.
While ideas and theories continue to be explored, it is important to approach discussions about the pre-Big Bang universe and its connection to black holes with caution, as they currently reside in the realm of speculation and are subject to ongoing scientific investigation.