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Research

Publications: Dr Timothy Clifton

Thomas DB, Clifton T, Anton T ( 2022 ) . Scale-Dependent Gravitational Couplings in Parameterised Post-Newtonian Cosmology .
Anton T, Clifton T ( 2022 ) . The momentum constraint equation in parameterised post-Newtonian cosmology . Classical and Quantum Gravity vol. 39 , ( 9 )
Fernandes PGS, Carrilho P, Clifton T, Mulryne DJ ( 2022 ) . The 4D Einstein-Gauss-Bonnet Theory of Gravity: A Review .
Fernandes PGS, Carrilho P, Clifton T, Mulryne DJ ( 2022 ) . The 4D Einstein–Gauss–Bonnet theory of gravity: a review . Classical and Quantum Gravity vol. 39 , ( 6 ) 063001 - 063001 .
Gallagher CS, Clifton T, Clarkson C ( 2021 ) . Multi-Scale Perturbation Theory II: Solutions and Leading-Order Bispectrum in the $Λ$CDM Universe . Journal of Cosmology and Astroparticle Physics vol. 08 , Article 048 ,
Fernandes PGS, Carrilho P, Clifton T, Mulryne DJ ( 2021 ) . Black Holes in the Scalar-Tensor Formulation of 4D Einstein-Gauss-Bonnet Gravity: Uniqueness of Solutions, and a New Candidate for Dark Matter . Physical Review D: Particles, Fields, Gravitation and Cosmology vol. 104 , Article 044029 ,
Fernandes PGS, Carrilho P, Clifton T, Mulryne DJ ( 2021 ) . Black Holes in the Scalar-Tensor Formulation of 4D Einstein-Gauss-Bonnet Gravity: Uniqueness of Solutions, and a New Candidate for Dark Matter .
Clifton T, Carrilho P, Fernandes PGS, Mulryne DJ ( 2020 ) . Observational constraints on the regularized 4D Einstein-Gauss-Bonnet theory of gravity . Physical Review D vol. 102 , ( 8 ) 084005 - 084005 .
Fernandes PGS, Carrilho P, Clifton T, Mulryne DJ ( 2020 ) . Derivation of Regularized Field Equations for the Einstein-Gauss-Bonnet Theory in Four Dimensions . Physical Review D vol. 102 , ( 2 ) Article 024025 ,
Clifton T, Carrilho P, Fernandes PGS, Mulryne DJ ( 2020 ) . Observational Constraints on the Regularized 4D Einstein-Gauss-Bonnet Theory of Gravity .
Fernandes PGS, Carrilho P, Clifton T, Mulryne DJ ( 2020 ) . Derivation of Regularized Field Equations for the Einstein-Gauss-Bonnet Theory in Four Dimensions .
Clifton T, Gallagher CS, Goldberg S, Malik KA ( 2020 ) . Viable Gauge Choices in Cosmologies with Non-Linear Structures . Physical Review D: Particles, Fields, Gravitation and Cosmology vol. 101 , ( 6 ) Article 063530 ,
Gallagher CS, Clifton T, Clarkson C ( 2020 ) . Multi-scale perturbation theory. Part I. Methodology and leading-order bispectrum corrections in the matter-dominated era . Journal of Cosmology and Astroparticle Physics vol. 2020 , ( 03 ) 011 - 011 .
Clifton T, Sussman RA ( 2019 ) . Cosmological Backreaction in Spherical and Plane Symmetric Dust-Filled Space-Times . Classical and Quantum Gravity vol. 36 , Article 205004 ,
Durk J, Clifton T ( 2019 ) . Discrete Cosmological Models in the Brans-Dicke Theory of Gravity . Classical and Quantum Gravity vol. 36 , ( 18 ) Article 185011 ,
Clifton T, Sanghai VAA ( 2019 ) . Parametrizing theories of gravity on large and small scales in cosmology . Physical Review Letters vol. 122 , 011301 - 011301 .
Gallagher CS, Clifton T ( 2018 ) . Relativistic Euler equations in cosmologies with nonlinear structures . Physical Review D vol. 98 , ( 10 ) 103516 - 103516 .
CLIFTON TA, Bentivegna E, DURK J, Korzynski M, Rosquist K ( 2018 ) . Black-Hole Lattices as Cosmological Models . Classical and Quantum Gravity vol. 35 , Article 175004 ,
Goldberg SR, Gallagher C, Clifton T ( 2017 ) . Perturbation theory for cosmologies with non-linear structure . Physical Review -Series d- vol. 96 , Article 103508 ,
Durk J, Clifton T ( 2017 ) . A quasi-static approach to structure formation in black hole universes . JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS ( 10 ) Article ARTN 012 ,
Sanghai VAA, Fleury P, Clifton T ( 2017 ) . Ray tracing and Hubble diagrams in post-Newtonian cosmology . Journal of Cosmology and Astroparticle Physics ( 7 ) Article ARTN 028 ,
Clifton T, Carr B, Coley A ( 2017 ) . Persistent black holes in bouncing cosmologies . CLASSICAL AND QUANTUM GRAVITY vol. 34 , ( 13 ) Article ARTN 135005 ,
Bibi R, Clifton T, Durk J ( 2017 ) . Cosmological solutions with charged black holes . General Relativity and Gravitation vol. 49 , ( 7 )
CLIFTON TA, Durk J ( 2017 ) . Exact initial data for black hole universes with a cosmological constant . Classical and Quantum Gravity vol. 34 , ( 6 ) Article 065009 ,
Clifton T, Barrow JD ( 2017 ) . Decay of the Cosmic Vacuum Energy . Gravity and the Quantum, Festschrift for T. Padmanabhan, eds. J Singh Bagla and S. Engineer, series Fundamental Theories of Physics 187, (Springer, New York), pp. 61-71 (2017)
CLIFTON TA, Sanghai V ( 2017 ) . Parameterized post-Newtonian cosmology . Classical and Quantum Gravity vol. 34 , ( 6 ) 065003 - 065003 .
Goldberg S, Clifton TA, Malik K ( 2017 ) . Cosmology on all scales: A two-parameter perturbation expansion . Physical Review D vol. 95 , ( 4 ) 043503 - 043503 .
Clifton T, Gregoris D, Rosquist K ( 2017 ) . The Magnetic Part of the Weyl Tensor, and the Expansion of Discrete Universes . General Relativity and Gravitation vol. 49 , Article 2 , 1 - 40 .
Clifton T, Gregoris D, Rosquist K ( 2017 ) . The magnetic part of the Weyl tensor, and the expansion of discrete universes . General Relativity and Gravitation vol. 49 , ( 2 ) Article 30 ,
Sanghai VAA, Clifton T ( 2016 ) . Cosmological backreaction in the presence of radiation and a cosmological constant . Physical Review D: Particles, Fields, Gravitation and Cosmology vol. 94 , ( 2 ) 023505 - 023505 .
Sanghai VAA, Clifton T ( 2016 ) . Erratum: Post-Newtonian cosmological modelling (Physical Review D - Particles, Fields, Gravitation and Cosmology (2015) 91 (103532)) . Physical Review D vol. 93 , ( 8 )
Clifton T, Gregoris D, Rosquist K ( 2015 ) . Applications of black hole lattices in relativistic cosmology . AIP Conference Proceedings . vol. 1693 ,
Sanghai VAA, Clifton T ( 2015 ) . Post-Newtonian cosmological modelling . Physical Review D - Particles, Fields, Gravitation and Cosmology vol. 91 , ( 10 )
Clifton T, Dunsby PKS ( 2015 ) . On the emergence of accelerating cosmic expansion in f(R) theories of gravity . Physical Review D vol. 91 , ( 10 )
CLIFTON T ( 2015 ) . BACK-REACTION IN RELATIVISTIC COSMOLOGY . Conference: The Thirteenth Marcel Grossmann Meeting2553 - 2565 .
Clarkson C, Clifton T, Coley A, Sung R ( 2014 ) . Erratum: Observational constraints on the averaged universe (Physical Review D - Particles, Fields, Gravitation and Cosmology (2012) 85 (043506)) . Physical Review D - Particles, Fields, Gravitation and Cosmology vol. 90 , ( 4 )
Clifton T ( 2014 ) . The Method of Images in Cosmology . Class. Quantum Grav. vol. 31 ,
Clifton T, Gregoris D, Rosquist K ( 2014 ) . Piecewise Silence in Discrete Cosmological Models . Class. Quantum Grav. vol. 31 ,
Clifton T, Gregoris D, Rosquist K, Tavakol R ( 2013 ) . Exact Evolution of Discrete Relativistic Cosmological Models . JCAP vol. 11 , Article 010 ,
Clifton T, Ellis GFR, Tavakol R ( 2013 ) . A Gravitational Entropy Proposal . Classical and Quantum Gravity vol. 30 , Article 125009 ,
CLIFTON TA ( 2013 ) . BACK-REACTION IN RELATIVISTIC COSMOLOGY . International Journal of Modern Physics D: Gravitation, Astrophysics and Cosmology vol. 22 , ( 3 ) Article 133004 ,
CLIFTON TA ( 2013 ) . G. F. R. Ellis, R. Maartens and M. A. H. MacCallum: Relativistic cosmology . General Relativity and Gravitation
Clifton T, Dunsby P, Goswami R, Nzioki AM ( 2012 ) . On the absence of the usual weak-field limit, and the impossibility of embedding some known solutions for isolated masses in cosmologies with f(R) dark energy . Physical Review D: Particles, Fields, Gravitation and Cosmology vol. 87 , Article 063517 ,
Clifton T, Coley A, Hoogen RVD ( 2012 ) . Observational Cosmology in Macroscopic Gravity . JCAP 10(2012)044
Clifton T, Rosquist K, Tavakol R ( 2012 ) . An exact quantification of backreaction in relativistic cosmology . PHYSICAL REVIEW D vol. 86 , ( 4 ) Article ARTN 043506 ,
Clifton T, Clarkson C, Bull P ( 2012 ) . Isotropic Blackbody Cosmic Microwave Background Radiation as Evidence for a Homogeneous Universe . PHYSICAL REVIEW LETTERS vol. 109 , ( 5 ) Article ARTN 051303 ,
CLIFTON TA, Bull P ( 2012 ) . Local and non-local measures of acceleration in cosmology . Physical Review D: Particles, Fields, Gravitation and Cosmology vol. 85 , ( 10 ) Article 103512 ,
Bull P, Clifton T ( 2012 ) . Local and nonlocal measures of acceleration in cosmology . PHYSICAL REVIEW D vol. 85 , ( 10 ) Article ARTN 103512 ,
Clarkson C, Clifton T, Coley A, Sung R ( 2012 ) . Observational constraints on the averaged universe . Physical Review D - Particles, Fields, Gravitation and Cosmology vol. 85 , ( 4 )
CLIFTON TA, BULL, P, FERREIRA PG ( 2012 ) . The kSZ effect as a test of general radial inhomogeneity in LTB cosmology . Physical Review D: Particles, Fields, Gravitation and Cosmology vol. 85 , Article 024002 ,
Clifton T, Clarkson C, Bull P ( 2011 ) . The isotropic blackbody CMB as evidence for a homogeneous universe . Phys. Rev. Lett. vol. 109 ,
Clarkson C, Clifton T, Coley A, Sung R ( 2011 ) . Observational Constraints on the Averaged Universe .
Clifton T, Ferreira PG, O'Donnell K ( 2011 ) . An Improved Treatment of Optics in the Lindquist-Wheeler Models . Phys. Rev. D vol. 85 ,
Bull P, Clifton T, Ferreira PG ( 2011 ) . The kSZ effect as a test of general radial inhomogeneity in LTB cosmology .
Shafieloo A, Clifton T, Ferreira P ( 2011 ) . The crossing statistic: dealing with unknown errors in the dispersion of Type Ia supernovae . Journal of Cosmology and Astroparticle Physics vol. 2011 , ( 08 ) 017 - 017 .
Clifton T, Ferreira PG, Padilla A, Skordis C ( 2011 ) . Modified Gravity and Cosmology . Physics Reports vol. 513 ,
Clifton T ( 2011 ) . Is Dark Energy an illusion? . Progress in Particle and Nuclear Physics vol. 66 , ( 2 ) 181 - 192 .
Clifton T, Bañados M, Skordis C ( 2010 ) . The Parameterised Post-Newtonian Limit of Bimetric Theories of Gravity . Class.Quant.Grav. vol. 27 ,
Clifton T ( 2010 ) . Cosmology Without Averaging . Class.Quant.Grav. vol. 28 ,
Clifton T, Zlosnik TG ( 2010 ) . FRW cosmology in Milgrom's bimetric theory of gravity . Phys.Rev.D vol. 81 ,
Clifton T, Barrow JD ( 2010 ) . Observational Constraints on the Completeness of Space near Astrophysical Objects . Phys.Rev.D vol. 81 ,
Clifton T, Ferreira PG ( 2009 ) . Errors in Estimating Omega_Lambda due to the Fluid Approximation . JCAP vol. 0910 ,
Clifton T, Ferreira PG ( 2009 ) . Archipelagian Cosmology: Dynamics and Observables in a Universe with Discretized Matter Content . Phys.Rev.D80:103503,2009; Phys.Rev.D84:109902,2011 vol. 80 , ( 10 ) Article 103503 ,
Clifton T, Ferreira PG ( 2009 ) . Does dark energy really exist? . Sci Am vol. 300 , ( 4 ) 48 - 55 .
Clarkson C, Clifton T, February S ( 2009 ) . Perturbation Theory in Lemaitre-Tolman-Bondi Cosmology . JCAP vol. 06 ,
Clifton T, Ferreira PG, Zuntz J ( 2009 ) . What the small angle CMB really tells us about the curvature of the Universe . JCAP vol. 0907 ,
Clifton T, Zuntz J ( 2009 ) . Hubble Diagram Dispersion From Large-Scale Structure . Mon. Not. R. Astron. Soc. vol. 400 ,
Clifton T ( 2008 ) . Higher Powers in Gravitation . Phys.Rev.D vol. 78 ,
Clifton T, Ferreira PG, Land K ( 2008 ) . Living in a Void: Testing the Copernican Principle with Distant Supernovae . Phys. Rev. Lett. 101 (2008) 131302 vol. 101 , ( 13 ) Article 131302 ,
Clifton T ( 2008 ) . Properties of Black Hole Radiation From Tunnelling . Class.Quant.Grav. vol. 25 ,
Clifton T ( 2008 ) . The Parameterised Post-Newtonian Limit of Fourth-Order Theories of Gravity . Phys.Rev.D vol. 77 ,
Clifton T, Weisberg JM ( 2007 ) . A Simple Model for Pulse Profiles from Precessing Pulsars, with Special Application to Relativistic Binary PSR B1913+16 . Astrophys.J. vol. 679 , 687 - 696 .
Clifton T, Shenker S, Sivanandam N ( 2007 ) . Volume Weighted Measures of Eternal Inflation in the Bousso-Polchinski Landscape . JHEP vol. 0709 ,
Clifton T ( 2007 ) . Exact Friedmann Solutions in Higher-Order Gravity Theories . Class.Quant.Grav. vol. 24 , 5073 - 5091 .
Clifton T, Barrow JD ( 2007 ) . The Ups and Downs of Cyclic Universes . Phys.Rev.D vol. 75 ,
Clifton T, Linde A, Sivanandam N ( 2007 ) . Islands in the landscape . JHEP vol. 0702 ,
Clifton T ( 2006 ) . Spherically Symmetric Solutions to Fourth-Order Theories of Gravity . Class.Quant.Grav. vol. 23 ,
Barrow JD, Clifton T ( 2006 ) . Cosmologies with Energy Exchange . Phys.Rev.D vol. 73 ,
Clifton T, Barrow JD ( 2006 ) . Decaying Gravity . Phys.Rev.D vol. 73 ,
Clifton T, Barrow JD ( 2006 ) . Further Exact Cosmological Solutions to Higher-Order Gravity Theories . Class.Quant.Grav. vol. 23 ,
Clifton T, Barrow JD ( 2005 ) . The Existence of Godel, Einstein and de Sitter Universes . Phys.Rev. D vol. 72 ,
Barrow JD, Clifton T ( 2005 ) . Exact cosmological solutions of scale-invariant gravity theories . Class.Quant.Grav. vol. 23 ,
Clifton T, Barrow JD ( 2005 ) . The Power of General Relativity . Phys.Rev.D vol. 72 ,
Clifton T, Barrow JD, Scherrer RJ ( 2005 ) . Constraints on the Variation of G from Primordial Nucleosynthesis . Phys.Rev. D vol. 71 ,
Clifton T, Mota DF, Barrow JD ( 2004 ) . Inhomogeneous Gravity . Mon.Not.Roy.Astron.Soc. vol. 358 ,