6 papers
Is Loop Quantum Gravity a QFT ?
Martin Rainer
We investigate up to which extend the kinematic setting of loop quantum gravity can be fit into a diffeomorphism invariant setting of algebraic QFT generalizing the Haag-Kastler se…
Multidimensional Sigma-Model with Black Holes and p-Branes
Martin Rainer
The bosonic content of string theory in curved background of multidimensional structure with p-branes has a systematic geometrical description as an effective sigma-model of gravit…
On the fundamental length of quantum geometry and the black hole entropy
M. Rainer
The geometric operators of area, volume, and length, depend on a fundamental length l of quantum geometry which is a priori arbitrary rather than equal to the Planck length l_P. Th…
A regularizing commutant duality for a kinematically covariant partial ordered net of observables
M. Rainer, H. Salehi
We consider a net of *-algebras, locally around any point of observation, equipped with a natural partial order related to the isotony property. Assuming the underlying manifold of…
Regularized Algebraic Nets for General Covariant QFT on Differentiable Manifolds
M. Rainer
Quantum general relativity may be considered as generally covariant QFT on differentiable manifolds, without any a priori metric structure. The kinematically covariance group acts…
Stability Properties of the Starobinsky Cosmological Model
U. Kasper, S. Kluske, M. Rainer +2
We discuss the instabilities appearing in the cosmological model with a quasi de Sitter phase following from a fourth-order gravity theory. Both the classical equation as well as t…