Quantum Gravity Models: Other ideas, like asymptotically safe gravity or causal dynamical triangulation, try to bridge the gap with different mathematical tricks.
Why Haven’t We Found It?
No ToE has been experimentally confirmed. String theory and M-theory predict phenomena (like supersymmetry or extra dimensions) that current experiments, like those at the Large Hadron Collider, haven’t detected. Loop quantum gravity struggles to reproduce the full Standard Model. Plus, testing these theories often requires energies or conditions (e.g., Planck-scale physics) far beyond our technological reach.