11 citations · 22 across the 7 of their papers we have counts for
8 papers
Unimodular boundary time for Regge calculus
Steffen Gielen, Sofie Ried
Henneaux-Teitelboim gravity is a diffeomorphism-invariant formulation of unimodular gravity that is locally equivalent to general relativity but includes an extra boundary variable…
Inflation in unimodular loop quantum cosmology
Steffen Gielen, Rita B. Neves
We study inflation in the setting of unimodular loop quantum cosmology, where time evolution is defined in unimodular time rather than with respect to a free, massless scalar field…
Boundary conditions and Hilbert spaces in no-roll quantum cosmology
Steffen Gielen
We construct Hilbert spaces for the minisuperspace quantum cosmology of a closed Universe in the limit of extreme slow-roll inflation, in which the scalar field is approximated as…
Cyclic Kruskal Universe: a quantum-corrected Schwarzschild black hole in unitary unimodular gravity
Steffen Gielen, Sofie Ried
We analyse the physical properties of an analytical, nonsingular quantum-corrected black hole solution recently derived in a minisuperspace model for unimodular gravity under the a…
Quantum Schwarzschild-(A)dS Black Holes: Unitarity and Singularity Resolution
Steffen Gielen, Sofie Ried
We consider the canonical quantisation of spherically symmetric spacetimes within unimodular gravity, leaving sign choices in the metric general enough to include both the interior…
Low-curvature quantum corrections from unitary evolution of de Sitter space
Steffen Gielen, Rita B. Neves
We study the quantum dynamics of de Sitter space formulated as a minisuperspace model with flat spatial hypersurfaces in unimodular gravity, both in the Wheeler-DeWitt approach and…
Black hole singularity resolution in unimodular gravity from unitarity
Steffen Gielen, Lucía Menéndez-Pidal
We study the quantum dynamics of an interior planar AdS (anti-de Sitter) black hole, requiring unitarity in the natural time coordinate conjugate to the cosmological "constant of m…
Quantum Cosmology
Steffen Gielen
Invited contribution to the Encyclopedia of Mathematical Physics (2nd edition), providing an overview over some main ideas and results in quantum cosmology. Key points: Canonical q…