QG2 - Quantum Fields |
Speaker_ |
Mercuri, Simone |
Co-autors |
Giovanni Montani |
Talk _ |
Is Torsion a Fundamental Physical Field? |
Abstract _ |
The introduction of Torsion in the framework of Einstein's theories is in general motivated by no gauge principle. But the invariance of the gravitational interaction under the group of diffeomorphisms obliges to consider not only the usual ''pure'' local Lorentz invariance but also the local rotations generated by the diff. group on the spinor bundle. This allows us to introduce two Lorentz valued connections: the spin connection and the contortion tensor. Our theory gives a gauge motivation to introduce Torsion and reduces the four-spinor interaction term of Einstein-Cartan theory to a usual vector gauge interaction. |