The concept of there being a Big Bang is a Bible related concept which the scientific community has adopted to appease religious organisations.
Quote from Bible - In the beginning God said " Let there be light, and there was light."
This is just a ruling class construct which has the purpose making the universe appear less imposing and the reduce the massive and overwhelming scale of the universe into a manageable unit.
Human ego can’t allow the universe to have existed forever into the past because it would make human endeavour appear futile and pointless.
Thus, in order to protect the integrity of the human ego and vanity, humans have constructed a false history of the universe, so as to reduce the magnitude of the universe into something that has an accountable scale in terms of human existence.
Also, they have made the universe mortal. The universe had a birth and will have a death. Thus, the universe has been made mortal.
Evidence suggests that these are false religious concepts which the science community has chosen to adopt in order to allow scientific research into previously considered religious matters.
The concept of a Big Bang, is thus, a retarding element, which has prevented science from moving forward.
The concept of a Big Bang has created a whole series of physical laws and conditions which has diverted physics and science from achieving a more forward moving policy and has prevented a great deal of innovation and change.