Video: In this artist’s conception, the network underlying space-time in loop quantum gravity is shown as a series of colored faces.The video shows the behavior of space-time at the Planck scale, the ...

String theory requires that space-time have 10 dimensions; LQG doesn’t work in higher dimensions. String theory also implies the existence of supersymmetry, in which all known particles have yet ...

In string theory, matter’s basic particles are tiny vibrating snippets of energy, ... So whether general relativity’s time loops will survive in a deeper theory remains an open question.

Quantum mechanics tells us that the forces of nature come in discrete, tiny chunks. Gravity, the bending of space-time, is a force. So is space-time quantized as well?

One, going by the name of loop quantum gravity, retains Einstein's theory essentially intact but changes the procedure for implementing it in quantum mechanics [see “Atoms of Space and Time ...

Physics The string-loop theory that might finally untangle the universe. Could two rival theories of the make-up of the cosmos really be the same thing?

In loop quantum gravity, space and time are not smooth and continuous the way they are in general relativity. Instead they are made of discrete components—what Ashtekar calls “chunks or atoms ...