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18 papers · 2 filters
From covariant to canonical formulations of discrete gravity
Bianca Dittrich, Philipp A Hoehn
Starting from an action for discretized gravity we derive a canonical formalism that exactly reproduces the dynamics and (broken) symmetries of the covariant formalism. For lineari…
The Newtonian Limit of Hermitian Gravity
Jeroen G. Burgers, Christiaan L. M. Mantz, Tomislav Prokopec
We construct the gauge invariant potentials of Hermitian Gravity and derive the linearized equations of motion they obey. A comparison reveals a striking similarity to the Bardeen…
Dynamics driven by the Trace Anomaly in FLRW Universes
J. F. Koksma
By means of a semiclassical analysis we show that the trace anomaly does not affect the cosmological constant. We calculate the evolution of the Hubble parameter in quasi de Sitter…
Cosmology of modified (but second order) gravity
Tomi S. Koivisto
This is a brief review of modified gravity cosmologies. Generically extensions of gravity action involve higher derivative terms, which can result in ghosts and instabilities. Ther…
Quantum Cosmological Metroland Model
Edward Anderson, Anne Franzen
Relational particle mechanics is useful for modelling whole-universe issues such as quantum cosmology or the problem of time in quantum gravity, including some aspects outside the…
Sub-leading asymptotic behaviour of area correlations in the Barrett-Crane model
J. Daniel Christensen, Igor Khavkine, Etera R. Livine +1
The Barrett-Crane spin foam model for quantum gravity provides an excellent setting for testing analytical and numerical tools used to probe spinfoam models. Here, we complete the…