Gravity remains a challenge in quantum theory from "summary" of The Quantum Universe by Brian Cox,Jeff Forshaw
The force of gravity, as described by classical physics, is a fundamental concept that governs the motion of celestial bodies in our universe. However, when it comes to understanding gravity on the quantum scale, things become far more complex and challenging. In the realm of quantum theory, the rules that govern the behavior of particles at the smallest scales of existence are vastly different from those that dictate the motion of planets and stars. The framework of quantum mechanics has been incredibly successful in explaining the behavior of particles such as electrons and photons, but when gravity is introduced into the mix, things start to get murky. One of the key issues that arises when trying to reconcile gravity with quantum theory is the concept of spacetime. In the theory of general relativity, spacetime is a dynamic, curved fabric that is influenced by the presence of mass and energy. On the other hand, in quantum mechanics, spacetime is considered to be smooth and continuous. These two conflicting views of spacetime create a significant roadblock ...
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