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gr-qc2025
Spectrum of pure gravity: full Hamiltonian analysis
Will Barker, Dražen Glavan
We perform a full Hamiltonian constraint analysis of pure Ricci-scalar-squared () gravity to clarify recent controversies regarding its particle spectrum. While it is well est…
gr-qc2024
Complete background cosmology of parity-even quadratic metric-affine gravity
Thomas Dyer, Will Barker, Damianos Iosifidis
The cosmology of metric-affine gravity is studied for the general, parity preserving action quadratic in curvature, torsion and non-metricity. The model contains 27 a priori indepe…
gr-qc2023
The effective inflationary potential of constant-torsion emergent gravity
C. Rew, W. E. V. Barker
Constant-torsion emergent gravity (CTEG) has a Lagrangian quadratic in curvature and torsion, but without any Einstein--Hilbert term. CTEG is motivated by a unitary, power-counting…