162 citations · 979 across the 17 of their papers we have counts for
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A reduced phase space quantisation of a model in Algebraic Quantum Gravity with polarised Gowdy symmetry
Kristina Giesel, Andreas Leitherer, David Winnekens
We consider a reduced phase space quantisation of a model with Gowdy symmetry in which gravity has been coupled to Gaussian dust. We complete the quantisation programme in re…
Hamiltonian Theory: Dynamics
Thomas Thiemann, Kristina Giesel
This chapter focuses on the status of the implementation of the dynamics in the canonical version of Loop Quantum Gravity (LQG). Concretely this means to provide a mathematical mea…
Coherent states for fractional powers of the harmonic oscillator Hamiltonian
Kristina Giesel, Almut Vetter
Inspired by special and general relativistic systems that can have Hamiltonians involving square roots, or more general fractional powers, in this article we address the question h…
Reduced Loop Quantization with four Klein-Gordon Scalar Fields as Reference Matter
Kristina Giesel, Almut Vetter
We perform a reduced phase space quantization of gravity using four Klein-Gordon scalar fields as reference matter as an alternative to the Brown-Kuchar dust model in [1], where du…
Manifestly Gauge Invariant Perturbations of Scalar-Tensor Theories of Gravity
Yu Han, Kristina Giesel, Yongge Ma
The general relativistic perturbations of scalar-tensor theories (STT) of gravity are studied in a manifestly gauge invariant Hamiltonian formalism. After the derivation of the Ham…
Scalar Material Reference Systems and Loop Quantum Gravity
Kristina Giesel, Thomas Thiemann
In the past, the possibility to employ (scalar) material reference systems in order to describe classical and quantum gravity directly in terms of gauge invariant (Dirac) observabl…