5 citations · 15 across the 16 of their papers we have counts for
16 papers
The limits of lattice inflation: a cautionary tale
Will Barker, Benjamin Gladwyn, Sebastian Zell
Cosmological lattice simulations have become important tools for studying non-perturbative dynamics in the early Universe. Many widely used codes, however, approximate the gravitat…
Fast Poisson brackets and constraint algebras in canonical gravity
Will Barker
In the study of alternative or extended theories of gravity, Dirac's Hamiltonian constraint algorithm is invaluable for enumerating the propagating modes and gauge symmetries. For…
Higher spin Lagrangians from higher derivative diffeomorphisms
Will Barker, Dario Francia, Carlo Marzo +1
The covariant description of massless particles of arbitrary spin typically employs symmetric tensors of rank and rests on a local symmetry carried by symmetric tensor paramete…
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…
Infrared foundations for quantum geometry II: Catalogue of all torsion-like theories including new ghost-tachyon-free cases
Will Barker, Carlo Marzo, Alessandro Santoni
The construction of consistent effective field theories in the infrared demands that models be defined by their underlying gauge symmetries, rather than by an arbitrary tuning of c…
Alleviating the Hubble tension with Torsion Condensation (TorC)
Sinah Legner, Will Handley, Will Barker +1
Constraints on the cosmological parameters of Torsion Condensation (TorC) are investigated using Planck 2018 Cosmic Microwave Background data. TorC is a case of Poincaré gauge theo…
Infrared foundations for quantum geometry I: Catalogue of totally symmetric rank-three field theories
Will Barker, Carlo Marzo, Alessandro Santoni
We systematically obtain all linear models which propagate a totally symmetric rank-three field without parity violation on a flat background. Each such model is defined exclusivel…
Can metric-affine gravity be saved?
Will Barker, Carlo Marzo, Alessandro Santoni
Like general relativity, metric-affine gravity should be a viable effective quantum theory, otherwise it is a mathematical curiosity without physical application. Assuming a pertur…
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…
Inflationary and Gravitational Wave Signatures of Small Primordial Black Holes as Dark Matter
Will Barker, Benjamin Gladwyn, Sebastian Zell
Mounting evidence suggests that the semi-classical description of a black hole breaks down at the latest after losing an O(1) fraction of its mass. As a result, effects such as mem…
PSALTer: Particle Spectrum for Any Tensor Lagrangian
Will Barker, Carlo Marzo, Claire Rigouzzo
We present the PSALTer software for efficiently computing the mass and energy of the particle spectrum for any (e.g. higher-rank) tensor field theory in the Wolfram Language. The u…
Every Poincaré gauge theory is conformal: a compelling case for dynamical vector torsion
Will Barker, Michael Hobson, Anthony Lasenby +2
The Poincaré gauge theory (PGT) of gravity provides a viable formulation of general relativity (Einstein-Cartan theory), and a popular model-building framework for modified gravity…
Particle spectra of general Ricci-type Palatini or metric-affine theories
W. Barker, C. Marzo
In the context of weak-field metric-affine (i.e. Palatini) gravity near Minkowski spacetime, we compute the particle spectra in the simultaneous presence of all independent contrac…
Consistent particle physics in metric-affine gravity from extended projective symmetry
Will Barker, Sebastian Zell
It is well-known that the Einstein-Hilbert action exhibits a projective invariance in metric-affine gravity, generated by a single vector (just like diffeomorphisms). However, this…
Particle spectra of gravity based on internal symmetry of quantum fields
Will Barker
We examine the weak-field, zero-coupling limit of Yang--Mills gravity as recently formulated by Partanen and Tulkki, viewed as a free quantum field theory. In this approximation th…
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…