What is the Big Bang Theory?
No Big Bang? Quantum equation predicts universe has no beginning
The universe may have existed forever, according to a new model that applies quantum correction terms to complement Einstein’s theory of general relativity. The model may also account for dark matter and dark energy, resolving multiple problems at once …
Although the Big Bang singularity arises directly and unavoidably from the mathematics of general relativity, some scientists see it as problematic because the math can explain only what happened immediately after—not at or before—the singularity.
Ahmed Farag Ali and Saurya Das, February 9, 2015, Physorg.com.
Quantum steps towards the Big Bang
Present-day physics cannot describe what happened in the Big Bang. Quantum theory and the theory of relativity fail in this almost infinitely dense and hot primal state of the universe.
Max Planck Institute for Gravitational Physics (Albert Einstein Institute) in Golm/Potsdam and the Perimeter Institute in Canada, September 3, 2013, Physorg.com.
Failures of Big Bang Cosmology by Steve Crothers (Technical)