For over a century, quantum mechanics and Einstein’s general relativity have stood as the cornerstones of modern physics, yet ...

But to take the stance of encouraging the free exploration of the possibilities of string theory means also encouraging the free exploration of other possibilities — loop quantum gravity ...

By unifying all fundamental forces of nature, including gravity, string theory could provide the long-sought quantum description of gravity that has eluded scientists for decades. Through a novel ...

While some attempts to give string theory predictive power are underway, many physicists are looking elsewhere. Whether in the form of loop quantum gravity, causal dynamical trangulation or ...

The potential to quantise space-time — not just gravity — is what sets quantum loop theory apart from string theory. However, like all current theories of quantum gravity, this is difficult to ...

Michael R. Douglas (Rutgers University, Piscataway, N.J.): "Superstring theory remains the prime candidate for describing quantum gravity and the other interactions, so it is all the more frustrating ...