Feynman diagrams are incredibly useful, but they're a perturbative (i.e., approximate) approach to calculating, and quantum field theory often yields fascinating, unique results when you take 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 current quantum field theory, causality is typically defined by the vanishing of field commutators for spacelike separations. Two researchers at the University of Massachusetts and Universidade ...

Quantum gravity tries to combine Einstein’s general theory of relativity with quantum mechanics. ... More Quantum corrections to classical gravity are visualized as loop diagrams, as the one ...

During the latter part of the 20th century, string theory was put forward as a unifying theory of physics foundations. String theory has not, however, fulfilled expectations. That is why we are of the ...

Crystal field theory is a theory that describes the breaking of the degeneracy of electronic orbitals (that is, their energy levels are not longer identical) that occurs in transition metal ...