The question of what, if anything, existed before the Big Bang is a topic of great speculation and debate in cosmology. It is an area where scientific understanding is limited, and various theories and hypotheses have been proposed to address this question.
The concept of "what caused the Big Bang" or "what existed before the Big Bang" is still an open question in cosmology because our current scientific models and observations cannot definitively answer it. The reason it is not widely discussed is primarily due to the limitations of our current understanding and the lack of empirical evidence to support specific claims about what might have preceded the Big Bang.
The Big Bang theory itself describes the expansion of the universe from an extremely hot and dense state, but it does not provide insight into what triggered the expansion or what may have existed prior to it. The universe as we know it began to evolve and expand from that initial singularity, and our current understanding of physics breaks down when we try to extrapolate back to the moment of the Big Bang.
Nevertheless, there are various cosmological models and theories that attempt to address the question of what may have preceded the Big Bang. Some propose the idea of a "multiverse" where our universe is just one of many universes, each with its own set of physical laws and properties. Others suggest the possibility of cyclic universes, where the universe goes through a series of expansions and contractions in an eternal cycle.
It's important to note that these ideas are still theoretical and are actively researched and debated within the scientific community. However, without empirical evidence or a comprehensive theory that can be tested and confirmed, any discussion about what might have existed before the Big Bang remains speculative and subject to ongoing scientific investigation and exploration.