45 citations · 114 across the 10 of their papers we have counts for
8 papers · 1 filter
Manifestly covariant variational principle for gauge theories of gravity
Michael Hobson, Anthony Lasenby, Will Barker
A variational principle for gauge theories of gravity is presented, which maintains manifest covariance under the symmetries to which the action is invariant, throughout the calcul…
Does gravitational confinement sustain flat galactic rotation curves without dark matter?
W. E. V. Barker, M. P. Hobson, A. N. Lasenby
The short answer is . Specifically, this paper considers a recent body of work which suggests that general relativity requires neither the support of dark mat…
Supercomputers against strong coupling in gravity with curvature and torsion
W. E. V. Barker
Many theories of gravity are spoiled by strongly coupled modes: the high computational cost of Hamiltonian analysis can obstruct the identification of these modes. A computer algeb…
Geometric multipliers and partial teleparallelism in Poincaré gauge theory
W. E. V. Barker
The dynamics of the torsion-powered teleparallel theory are only viable because thirty-six multiplier fields disable all components of the Riemann--Cartan curvature. We generalise…
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…