Loop quantum gravity, by contrast, is concerned less with the matter that inhabits space-time than with the quantum properties of space-time itself. In loop quantum gravity, or LQG, space-time is a ...

The quantum field theory framework needed some adjustment for Borinsky and Vogtmann to get the right count. For instance, in quantum field theory, two graphs that are mirror images of each other are ...

In loop quantum gravity there is no such thing as space – only fields. In “Loop quantum gravity” Carlo Rovelli explains how he arrived at a background-independent quantum field theory by treating the ...

It’s time we talked about loop quantum gravity. What exactly is it? What are the loops? And can it really defeat string theory in our quest for a Theory of Everything? PBS Space Time is ...

However, research on loop quantum cosmology offers a possible solution. It suggests that gravity, in effect, becomes repulsive. Consequently, loop quantum cosmology predicts that our present universe ...

When it comes to the question of a quantum theory of gravity, it's often said that string theory is the only game in town. These four alternatives might cause a rethink of that.

Quantum field theory marries the ideas of other quantum theories to depict all particles as “excitations” that arise in underlying fields. The British physicist Paul Dirac started the ball ...

Quantum mechanics is the study of atomic and subatomic particles at normal speeds, while quantum field theory is the study of those same particles at relativistic speeds.

In the last few decades, researchers have pursued the problem in two separate programs—string theory and loop quantum gravity—that are widely considered incompatible by their practitioners.