Quantum field theory, string theory and quantum gravity are nothing but imaginary nonsense.

Quantum mechanism theory builds on word puzzles. orbit, cloud, probability wave, wave function collapse, uncertainty principle, wave-particle duality. energy level, quantum states. All imaginary.

The godfather of QM, who won Nobel for photoelectric effect theory, confessed on his last days.
All these fifty years of conscious brooding have brought me no nearer to the answer to the question, 'What are light quanta?' Nowadays every Tom, D i c k and Harry thinks he knows it, but he is mistaken. -Albert Einstein

Anything quantum is nonsense. There is no field but force in nature. Gravity is simply induced electrostatic attraction force between neutrally charged matters/masses. Similar to sexual attraction between married couples and married couples.

From F=K x m1m2/rr and F=Ke x pq/rr, we can tell gravity is cause by electrostatic force, has the same nature as electrostatic force. 

In fact, mass is proportional to total charged particles it carries. Without charged particles, there is no force, no mass and no matter. 

Anything in the nature has its precise mechanism/cause and effect, nature does not play dice.

Present theoretical physics took science into a dark age, it will go nowhere but deeper nonsense.