Gravity as a topological gauge theory
Résumé
We describe a topological gauge theory with underlying Cartan geometry $G/H$ and principal $H$-bundle. The topological action is constructed as a linear combination of the Euler and Pontrjagin numbers coming from entries of the curvature $\bar{\Omega}$ of a Cartan connection. As an example we show that for $G = SO(4,1)$ (respectively $SO(3,2)$) for $\Lambda_0 > 0$, (respectively $\Lambda_0 < 0$) and $H=SO(3,1)$, a very particular linear combination yields the Holst + Euler and Pontrjagin of the curvature $R$ of the spin connection + Nieh-Yan + bare cosmological constant $\Lambda_0$ terms. Additionally, in this construction, the coupling constants of these different terms are inherently linked together. The other example treated is the one of the Möbius group $G= SO(4,2) /\{\pm I\}$ and $H = CO(4,2) \ltimes \mathbb{R}^{3,1}$. By considering a constraint on the "pair of frames" $(\alpha,\beta)$ we retrieve an action comprising all terms compatible with diffeomorphism invariance and local Lorentz invariance described in the previous example + kinetic term for a scalar field $+$ an interaction of that scalar field with the Torsion $T$, the scalar field being related to dilation. Finally, in both examples, we study the equations of motion associated to the total (Gauge + Matter) action. It is especially shown that one of the solutions in the Möbius case consists of Einstein's equations modified by the Holst and Nieh-Yan terms with an additional source term for curvature depending on specific variations of spin density of matter.
Mots clés
Holst term
coupling constant
constraint
gravitation: conformal
field theory: scalar
gauge field theory: topological
action: topological
spin: density
invariance: Lorentz
diffeomorphism: invariance
geometry: Cartan
matter: density
curvature
SO(4,2)
Nieh-Yan term
dilation
cosmological constant
field equations
SO(3,2)
SO(3,1)
kinetic
SO(4,1)
Einstein equation
torsion
gravitation: model
gravitation: topological
fibre bundle