Problems with the Big Bang.
THE GRAND UNIFIED THEORY
The Grand Unified theory hypothesizes that at the beginning of the Universe, the 4* primary forces of the Universe are one such as:
- Gravity
- Strong nuclear force
- Weak nuclear force
- Electromagnetism
*3 forces if you count the Strong and Weak nuclear forces as one
So if these forces are unified then separate, it might give insight that the Big Bang theory can do such impossible things.
BIG BANG CONTRADICTING WITH LAWS OF PHYSICS
Now, the Big Bang contradicts with the laws of Physics. An example of one of this that the Big Bang generates Energy which contradicts with the Conservation of Energy law, which states that Energy cannot be created nor destroyed.
One possible theory is that since the Universe was really dense and small at the time, classical Physics and other laws don't apply, and instead Quantum Physics was in play.