4 papers
Bessel-Hagen currents for linearised Weyl-squared gravity
Michael Hobson, Will Barker, Anthony Lasenby
For the Fierz-Pauli action the Bessel-Hagen construction does not produce a preferred local gauge-invariant energy-momentum tensor; it identifies only a gauge-invariant equivalence…
Numerical polology: towards next-generation model-building for cosmology
Will Barker, Will Handley, Michael Hobson +4
The dark sector need not be restricted to simple field content. Indeed, simple bosonic configurations, such as scalar-tensor or dark photon models, contrast with the much richer pi…
The radial metric function does not identify null surfaces
Yi-Hsiung Hsu, Will Barker, Michael Hobson +1
We investigate the conditions under which a hypersurface becomes null through the use of coordinate transformations. We demonstrate that, in static spacetimes, the correct criterio…
How black hole mimickers and Shapiro-free lenses signal effective dark matter
Lirui Yang, Will Barker, Tobias Mistele +1
We report the existence of two exotic compact objects in the leading relativistic model of modified Newtonian dynamics, namely aether-scalar-tensor theory. This model is consistent…