Prior to the Big Bang, nothing existed in the universe, according to Stephen Hawking, renowned British physicist.
Hawking was interviewed at a TV talk show Star Talk, which was aired on National Geographic Channel, on March 4, 2018, during which he proposed his theory that revealed what existed before the existence of the universe. His theory vastly relied on the assumption that the universe has no boundaries.
Hawking told Neil deGrasse Tyson, the TV host that, “The boundary condition of the universe … is that it has no boundary.” He explained that the Big Bang, which according to current theories on cosmology, marked the origin universe, was nothing more than the rapid expansion of matter from a state of extremely high density and temperature.
The theory holds that the universe in retrospective can shrink to the size of an extremely small “subatomic ball” known as the singularity. He said that, laws of physics and those of time, due to their framework, lose functionality within a tiny particle of heat and energy. This means that when the universe shrinks, ordinary real time shrinks infinitely, however, never reaching a definable starting point. He elaborated on the theory, stating that, real ordinary time was replaced by imaginary time and was in a bent form before the Big Bang.
He further said that “It was always reaching closer to nothing but didn’t become nothing. One can regard imaginary and real-time beginning at the South Pole. There is nothing south of the South Pole, so there was nothing around before the Big Bang.”
He thus concluded the talk show with the brief of his understanding of the universe and Big Bang theory, saying that, “There was never a Big Bang that produced something from nothing. It just seemed that way from mankind’s perspective.”
By saying this, he hinted that most of the things we, as humans believe, is derived from a human-centric perspective, which might limit the scope of human knowledge of the world.