What is the difference between string theory and loop gravity?

Loop quantum gravity doesn’t attempt to unify fundamental interactions. It is just a theory of quantum gravity. String theory starts from fundamental aspects of quantum theory. Loop quantum gravity, on the other hand, relies on general relativity and quantize gravitational field.

What is LoopLoop quantum gravity (LQG)?

Loop quantum gravity (LQG) is a theory of quantum gravity, merging quantum mechanics and general relativity, making it a possible candidate for a theory of everything.

Is there a quantum theory of gravity?

It is an attempt to develop a quantum theory of gravity based directly on Einstein’s geometric formulation rather than the treatment of gravity as a force. As a theory LQG postulates that the structure of space and time is composed of finite loops woven into an extremely fine fabric or network. These networks of loops are called spin networks.

How many research areas are there in quantum gravity?

The areas of research, which involves about 30 research groups worldwide, share the basic physical assumptions and the mathematical description of quantum space. Research has evolved in two directions: the more traditional canonical loop quantum gravity, and the newer covariant loop quantum gravity, called spin foam theory.

What is the difference between string theory and quantum theory?

String theories are developed on the same basic assumptions of quantum theory. String theories start from quantum theory. Quantum theory is a combination of all fundamental interactions except gravity.

What is loop quantum gravity?

Loop quantum gravity, on the other hand, relies on general relativity and quantize gravitational field. String theory works in higher dimensional space- times. But, loop quantum gravity doesn’t require higher dimensions.

Can string theory explain the duality of gravity?

The full version of the duality is a conjecture, but it has a well-understood limiting case that string theory plays no role in. Because strings don’t matter in this limiting case, it should be shared by any theory of quantum gravity. Pullin sees this as a contact point.