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Perturbations and the Future Conformal Boundary
A. N. Lasenby, W. J. Handley, D. J. Bartlett +1
The concordance model of cosmology predicts a universe which finishes in a finite amount of conformal time at a future conformal boundary. We show that for particular cases we stud…
Nonlinear Hamiltonian analysis of new quadratic torsion theories Part I. Cases with curvature-free constraints
W. E. V. Barker, A. N. Lasenby, M. P. Hobson +1
It was recently found that, when linearised in the absence of matter, 58 cases of the general gravitational theory with quadratic curvature and torsion are (i) free from ghosts and…
Mapping Poincaré gauge cosmology to Horndeski theory for emergent dark energy
W. E. V. Barker, A. N. Lasenby, M. P. Hobson +1
The ten-parameter, quadratic Poincaré gauge theory of gravity is a plausible alternative to general relativity. We show that the rich background cosmology of the gauge theory is de…
Addressing tension with emergent dark radiation in unitary gravity
W. E. V. Barker, A. N. Lasenby, M. P. Hobson +1
We propose a one-parameter extension to CDM, expected to strongly affect cosmological tensions. An effective dark radiation component in the early universe redshifts away as hot…
Quantum initial conditions for inflation and canonical invariance
F. J. Agocs, L. T. Hergt, W. J. Handley +2
We investigate the transformation of initial conditions for primordial curvature perturbations under two types of transformations of the associated action: simultaneous redefinitio…