2QO\ E\ JXULQJ RXW JUDYLW\ ZLOO we be able to answer the biggest question of all: where did the Universe come from?
The twin pillars of modern physics are Einstein’s theory of gravity, which describes galaxies and the Universe, and quantum theory, which describes atoms and their constituents. It has given us lasers, computers and nuclear reactors; it explains why the Sun shines and why the ground is solid. Einstein’s theory (which describes the large) and quantum theory (which describes the small) reign supreme in their own domains but have resisted merging. This would not be a problem; however, once up on a time – in the Big Bang – the Universe was very small. To understand how the Universe emerged from this, like a rabbit from a hat, we must therefore unite Einstein’s theory with quantum theory: to create a quantum theory of gravity.
Our understanding of gravity doesn’t match up with quantum theory. If we are ever going to understand the Big Bang, they need to be united