351 citations · 455 across the 13 of their papers we have counts for
14 papers
Compact binary systems in the post-Newtonian limit of gravitational theories with preferred frames
Oliver Pitt, Timothy Clifton
Gravitational-wave observations of compact-binary inspirals offer the opportunity to test deviations from general relativity in both strong and weak-field regimes. In previous work…
Post-Newtonian Global Conservation Laws in the Presence of Sensitive Bodies
Timothy Clifton, Asta Heinesen, Oliver Pitt
The parameterized post-Newtonian (PPN) approach is the state of the art formalism for performing theory independent tests of weak-field gravity, and for constraining possible devia…
Observational Quantities in Quasi-Newtonian Descriptions of Cosmological Space-Times
Asta Heinesen, Davide Fontana, Timothy Clifton
We investigate measures of distance and redshift in cosmological space-times that admit a shear-free foliation, which we henceforth refer to as `quasi-Newtonian'. Space expands iso…
Observational Tests for Distinguishing Classes of Cosmological Models
Asta Heinesen, Timothy Clifton
We investigate observational tests that can be used to distinguish between broad classes of cosmological models. This is achieved using curvature-consistency tests of the Friedmann…
Constraining the Cosmological Evolution of Post-Newtonian Parameters with Gravitational Wave Signals from Compact Binary Inspirals
Oliver Pitt, Timothy Clifton
Gravitational waves from compact binary inspirals offer a new opportunity to constrain the cosmological time dependence of gravitational coupling parameters, due to the high precis…
A New Paradigm for Testing Gravity: Theory-Independent Constraints Using Data From All Astrophysical and Cosmological Scales
Daniel B Thomas, Theodore Anton, Timothy Clifton
Testing General Relativity (GR) is a key science goal of much of modern physics, and usually results in constraints that are either theory or context specific. We present an holist…
Gravitational Slip in the Parameterized Post-Newtonian Cosmology
Theodore Anton, Timothy Clifton, Daniel B. Thomas
A key signature of general relativity is that the two scalar potentials and , when expressed in the longitudinal gauge, are equal in the absence of fluids with anisotropic s…
Emergent Cosmological Expansion in Scalar-Tensor Theories of Gravity
Chad Briddon, Timothy Clifton, Pierre Fleury
We consider the emergence of large-scale cosmological expansion in scalar-tensor theories of gravity. This is achieved by modelling sub-horizon regions of space-time as weak-field…
Constraining Post-Newtonian Parameters with the Cosmic Microwave Background
Daniel B. Thomas, Theodore Anton, Timothy Clifton +1
The Parameterised Post-Newtonian (PPN) approach is the default framework for performing precision tests of gravity in nearby astrophysical systems. In recent works we have extended…
A Radical Solution to the Hubble Tension Problem
Timothy Clifton, Neil Hyatt
The Hubble tension has proven to be stubbornly persistent, despite widespread efforts to relax it. As a possible resolution of this problem we propose a radical alternative to the…
Hubble Diagrams in Statistically Homogeneous, Anisotropic Universes
Theodore Anton, Timothy Clifton
We consider the form of Hubble diagrams that would be constructed by observers in universes that are homogeneous but anisotropic, when averaged over suitably large length-scales. T…
Alternative Theories of Gravity
T. Clifton
This work investigates alternative theories of gravity, the solutions to their field equations and the constraints that can be imposed upon them from observation and experiment. Sp…
Spherically Symmetric Solutions to Fourth-Order Theories of Gravity
T. Clifton
Gravitational theories generated from Lagrangians of the form f(R) are considered. The spherically symmetric solutions to these equations are discussed, paying particular attention…
The Power of General Relativity
Timothy Clifton, John D. Barrow
We study the cosmological and weak-field properties of theories of gravity derived by extending general relativity by means of a Lagrangian proportional to . This scale-fr…