Dr Timothy Clifton

Timothy Clifton

Reader in Relativity and Cosmology
Postgraduate Tutor for Astrophysics

School of Physical and Chemical Sciences
Queen Mary University of London
Google Scholar

Research

Cosmology, General Relativity, Gravity

Interests

I'm a theoretical cosmologist who builds mathematical models of the Universe, in order to understand what cosmological observations can tell us about relativistic gravity and the large-scale structure of space-time.

I graduated with a PhD from the University of Cambridge in 2006, and have worked as a post-doctoral researcher at Stanford University as a Lindemann Fellow, at the University of Oxford as a Junior Research Fellow of Jesus College, and at CERN as a CERN Fellow. I joined Queen Mary in 2012 as a Advanced Fellow of the STFC research council, and am now a Reader in the Astronomy Unit of the School of Physics and Astronomy. I am also a member of the editorial board of Classical and Quantum Gravity, and the post-graduate tutor for astrophysics at Queen Mary.

Publications

Relevant PublicationPublications of specific relevance to the Centre for Fundamental Physics

2023

Relevant PublicationAnton T and Clifton T (2023). Modelling the emergence of cosmic anisotropy from non-linear structures. Classical and Quantum Gravity, IOP Publishing vol. 40 (14), 145004-145004.  
20-06-2023
Relevant PublicationThomas DB, Clifton T and Anton T (2023). Scale-dependent gravitational couplings in Parameterised Post-Newtonian Cosmology. Journal of Cosmology and Astroparticle Physics, IOP Publishing vol. 2023 (04), 016-016.  
11-04-2023

2022

Relevant PublicationAnton T and Clifton T (2022). The momentum constraint equation in parameterised post-Newtonian cosmology. Classical and Quantum Gravity, IOP Publishing vol. 39 (9) 
14-04-2022
Relevant PublicationFernandes PGS, Carrilho P, Clifton T and Mulryne DJ (2022). The 4D Einstein–Gauss–Bonnet theory of gravity: a review. Classical and Quantum Gravity vol. 39 (6), 063001-063001.  
28-02-2022

2021

Relevant PublicationGallagher CS, Clifton T and Clarkson C (2021). Multi-Scale Perturbation Theory II: Solutions and Leading-Order Bispectrum in the $Λ$CDM Universe. Journal of Cosmology and Astroparticle Physics, IOP Publishing vol. 08 
20-08-2021
Relevant PublicationFernandes PGS, Carrilho P, Clifton T and 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, American Physical Society vol. 104 
11-08-2021

2020

bullet iconClifton T, Carrilho P, Fernandes PGS and Mulryne DJ (2020). Observational constraints on the regularized 4D Einstein-Gauss-Bonnet theory of gravity. Physical Review D, American Physical Society vol. 102 (8), 084005-084005.  
01-10-2020
bullet iconFernandes PGS, Carrilho P, Clifton T and Mulryne DJ (2020). Derivation of Regularized Field Equations for the Einstein-Gauss-Bonnet Theory in Four Dimensions. Physical Review D, American Physical Society vol. 102 (2) 
06-07-2020
bullet iconClifton T, Gallagher CS, Goldberg S and Malik KA (2020). Viable Gauge Choices in Cosmologies with Non-Linear Structures. Physical Review D: Particles, Fields, Gravitation and Cosmology, American Physical Society vol. 101 (6) 
25-03-2020
Relevant PublicationGallagher CS, Clifton T and 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, IOP Publishing vol. 2020 (03), 011-011.  
03-03-2020

2019

bullet iconClifton T and Sussman RA (2019). Cosmological Backreaction in Spherical and Plane Symmetric Dust-Filled Space-Times. Classical and Quantum Gravity, IOP Publishing vol. 36 
18-09-2019
bullet iconDurk J and Clifton T (2019). Discrete Cosmological Models in the Brans-Dicke Theory of Gravity. Classical and Quantum Gravity, IOP Publishing vol. 36 (18) 
23-08-2019
bullet iconClifton T and Sanghai VAA (2019). Parametrizing theories of gravity on large and small scales in cosmology. Physical Review Letters, American Physical Society vol. 122, 011301-011301.  
02-01-2019

2018

bullet iconGallagher CS and Clifton T (2018). Relativistic Euler equations in cosmologies with nonlinear structures. Physical Review D vol. 98 (10), 103516-103516.  
14-11-2018
bullet iconCLIFTON TA, Bentivegna E, DURK J, Korzynski M and Rosquist K (2018). Black-Hole Lattices as Cosmological Models. Classical and Quantum Gravity, IOP Publishing vol. 35 
25-07-2018

2017

bullet iconGoldberg SR, Gallagher C and Clifton T (2017). Perturbation theory for cosmologies with non-linear structure. Physical Review -Series d-, American Physical Society vol. 96 
10-11-2017
bullet iconDurk J and Clifton T (2017). A quasi-static approach to structure formation in black hole universes. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (10) 
12-10-2017
bullet iconSanghai VAA, Fleury P and Clifton T (2017). Ray tracing and Hubble diagrams in post-Newtonian cosmology. Journal of Cosmology and Astroparticle Physics, IOP Publishing (7) 
17-07-2017
bullet iconClifton T, Carr B and Coley A (2017). Persistent black holes in bouncing cosmologies. CLASSICAL AND QUANTUM GRAVITY vol. 34 (13) 
06-07-2017
bullet iconBibi R, Clifton T and Durk J (2017). Cosmological solutions with charged black holes. General Relativity and Gravitation vol. 49 (7) 
30-06-2017
bullet iconCLIFTON TA and Durk J (2017). Exact initial data for black hole universes with a cosmological constant. Classical and Quantum Gravity, IOP Publishing vol. 34 (6) 
03-03-2017
bullet iconClifton T and 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) 
24-02-2017
bullet iconCLIFTON TA and Sanghai V (2017). Parameterized post-Newtonian cosmology. Classical and Quantum Gravity, IOP Publishing vol. 34 (6), 065003-065003.  
22-02-2017
bullet iconGoldberg S, Clifton TA and Malik K (2017). Cosmology on all scales: A two-parameter perturbation expansion. Physical Review D, American Physical Society vol. 95 (4), 043503-043503.  
06-02-2017
bullet iconClifton T, Gregoris D and Rosquist K (2017). The Magnetic Part of the Weyl Tensor, and the Expansion of Discrete Universes. General Relativity and Gravitation, Springer US vol. 49, 1-40.  
27-01-2017
bullet iconClifton T, Gregoris D and Rosquist K (2017). The magnetic part of the Weyl tensor, and the expansion of discrete universes. General Relativity and Gravitation, Springer Nature vol. 49 (2) 
27-01-2017

2016

bullet iconSanghai VAA and 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.  
01-07-2016
bullet iconSanghai VAA and 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) 
07-04-2016

2015

bullet iconClifton T, Gregoris D and Rosquist K (2015). Applications of black hole lattices in relativistic cosmology. 
17-12-2015
bullet iconClifton T and Dunsby PKS (2015). On the emergence of accelerating cosmic expansion in f(R) theories of gravity. Physical Review D, American Physical Society (APS) vol. 91 (10) 
15-05-2015
bullet iconSanghai VAA and Clifton T (2015). Post-Newtonian cosmological modelling. Physical Review D, American Physical Society (APS) vol. 91 (10) 
15-05-2015
bullet iconCLIFTON T (2015). BACK-REACTION IN RELATIVISTIC COSMOLOGY. The Thirteenth Marcel Grossmann Meeting
29-01-2015

2014

Relevant PublicationClarkson C, Clifton T, Coley A and Sung R (2014). Publisher’s Note: Observational constraints on the averaged universe [Phys. Rev. D 85, 043506 (2012)]. Physical Review D, American Physical Society (APS) vol. 90 (4) 
15-08-2014
bullet iconClifton T (2014). The Method of Images in Cosmology. Class. Quantum Grav. vol. 31 
13-05-2014
bullet iconClifton T, Gregoris D and Rosquist K (2014). Piecewise Silence in Discrete Cosmological Models. Class. Quantum Grav. vol. 31 
13-02-2014

2013

bullet iconClifton T, Gregoris D, Rosquist K and Tavakol R (2013). Exact Evolution of Discrete Relativistic Cosmological Models. JCAP vol. 11 
11-09-2013
bullet iconClifton T, Ellis GFR and Tavakol R (2013). A Gravitational Entropy Proposal. Classical and Quantum Gravity vol. 30 
22-03-2013
bullet iconCLIFTON TA (2013). BACK-REACTION IN RELATIVISTIC COSMOLOGY. International Journal of Modern Physics D: Gravitation, Astrophysics and Cosmology, http://www.worldscientific.com/doi/pdfplus/10.1142/S0218271813300048 vol. 22 (3) 
01-03-2013
bullet iconCLIFTON TA (2013). G. F. R. Ellis, R. Maartens and M. A. H. MacCallum: Relativistic cosmology. General Relativity and Gravitation 
01-01-2013

2012

bullet iconClifton T, Dunsby P, Goswami R and 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 
02-10-2012
bullet iconClifton T, Coley A and Hoogen RVD (2012). Observational Cosmology in Macroscopic Gravity. JCAP 10(2012)044 
05-09-2012
bullet iconClifton T, Rosquist K and Tavakol R (2012). An exact quantification of backreaction in relativistic cosmology. PHYSICAL REVIEW D vol. 86 (4) 
03-08-2012
bullet iconCLIFTON TA and Bull P (2012). Local and non-local measures of acceleration in cosmology. Physical Review D: Particles, Fields, Gravitation and Cosmology vol. 85 (10) 
10-05-2012
Relevant PublicationClarkson C, Clifton T, Coley A and Sung R (2012). Observational constraints on the averaged universe. Physical Review D, American Physical Society (APS) vol. 85 (4) 
07-02-2012
bullet iconCLIFTON TA, BULL P and FERREIRA PG (2012). The kSZ effect as a test of general radial inhomogeneity in LTB cosmology. Physical Review D: Particles, Fields, Gravitation and Cosmology, Cornell University Library vol. 85 
03-01-2012
bullet iconBull P and Clifton T (2012). Local and nonlocal measures of acceleration in cosmology. PHYSICAL REVIEW D vol. 85 (10) 
01-01-2012
Relevant PublicationClifton T, Clarkson C and Bull P (2012). Isotropic Blackbody Cosmic Microwave Background Radiation as Evidence for a Homogeneous Universe. PHYSICAL REVIEW LETTERS vol. 109 (5) 
01-01-2012

2011

bullet iconClifton T, Clarkson C and Bull P (2011). The isotropic blackbody CMB as evidence for a homogeneous universe. Phys. Rev. Lett. vol. 109 
16-11-2011
bullet iconClifton T, Ferreira PG and O'Donnell K (2011). An Improved Treatment of Optics in the Lindquist-Wheeler Models. Phys. Rev. D vol. 85 
14-10-2011
bullet iconShafieloo A, Clifton T and Ferreira P (2011). The crossing statistic: dealing with unknown errors in the dispersion of Type Ia supernovae. Journal of Cosmology and Astroparticle Physics, IOP Publishing vol. 2011 (08), 017-017.  
01-08-2011
bullet iconClifton T, Ferreira PG, Padilla A and Skordis C (2011). Modified Gravity and Cosmology. Physics Reports vol. 513 
13-06-2011
bullet iconClifton T (2011). Is Dark Energy an illusion? Progress in Particle and Nuclear Physics, Elsevier vol. 66 (2), 181-192.  
01-04-2011

2010

bullet iconClifton T, Bañados M and Skordis C (2010). The Parameterised Post-Newtonian Limit of Bimetric Theories of Gravity. Class.Quant.Grav. vol. 27 
29-06-2010
bullet iconClifton T (2010). Cosmology Without Averaging. Class.Quant.Grav. vol. 28 
05-05-2010
bullet iconClifton T and Zlosnik TG (2010). FRW cosmology in Milgrom's bimetric theory of gravity. Phys.Rev.D vol. 81 
07-02-2010
bullet iconClifton T and Barrow JD (2010). Observational Constraints on the Completeness of Space near Astrophysical Objects. Phys.Rev.D vol. 81 
25-01-2010

2009

bullet iconClifton T and Ferreira PG (2009). Errors in Estimating Omega_Lambda due to the Fluid Approximation. JCAP vol. 0910 
31-08-2009
bullet iconClifton T and 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) 
23-07-2009
bullet iconClifton T and Ferreira PG (2009). Does Dark Energy Really Exist? Scientific American, Springer Nature vol. 300 (4), 48-55.  
01-04-2009
Relevant PublicationClarkson C, Clifton T and February S (2009). Perturbation Theory in Lemaitre-Tolman-Bondi Cosmology. JCAP vol. 06 
29-03-2009
bullet iconClifton T, Ferreira PG and Zuntz J (2009). What the small angle CMB really tells us about the curvature of the Universe. JCAP vol. 0907 
08-02-2009
bullet iconClifton T and Zuntz J (2009). Hubble Diagram Dispersion From Large-Scale Structure. Mon. Not. R. Astron. Soc. vol. 400 
04-02-2009

2008

bullet iconClifton T (2008). Higher Powers in Gravitation. Phys.Rev.D vol. 78 
29-07-2008
bullet iconClifton T, Ferreira PG and Land K (2008). Living in a Void: Testing the Copernican Principle with Distant Supernovae. Phys. Rev. Lett. 101 (2008) 131302 vol. 101 (13) 
09-07-2008
bullet iconClifton T (2008). Properties of Black Hole Radiation From Tunnelling. Class.Quant.Grav. vol. 25 
16-04-2008
bullet iconClifton T (2008). The Parameterised Post-Newtonian Limit of Fourth-Order Theories of Gravity. Phys.Rev.D vol. 77 
07-01-2008

2007

bullet iconClifton T and 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.  
07-08-2007
bullet iconClifton T, Shenker S and Sivanandam N (2007). Volume Weighted Measures of Eternal Inflation in the Bousso-Polchinski Landscape. JHEP vol. 0709 
21-06-2007
bullet iconClifton T (2007). Exact Friedmann Solutions in Higher-Order Gravity Theories. Class.Quant.Grav. vol. 24, 5073-5091.  
26-03-2007
bullet iconClifton T and Barrow JD (2007). The Ups and Downs of Cyclic Universes. Phys.Rev.D vol. 75 
12-01-2007
bullet iconClifton T, Linde A and Sivanandam N (2007). Islands in the landscape. JHEP vol. 0702 
10-01-2007

2006

bullet iconClifton T (2006). Spherically Symmetric Solutions to Fourth-Order Theories of Gravity. Class.Quant.Grav. vol. 23 
22-07-2006
bullet iconBarrow JD and Clifton T (2006). Cosmologies with Energy Exchange. Phys.Rev.D vol. 73 
17-04-2006
bullet iconClifton T and Barrow JD (2006). Decaying Gravity. Phys.Rev.D vol. 73 
29-03-2006
bullet iconClifton T and Barrow JD (2006). Further Exact Cosmological Solutions to Higher-Order Gravity Theories. Class.Quant.Grav. vol. 23 
27-01-2006

2005

bullet iconClifton T and Barrow JD (2005). The Existence of Godel, Einstein and de Sitter Universes. Phys.Rev. D vol. 72 
14-11-2005
bullet iconBarrow JD and Clifton T (2005). Exact cosmological solutions of scale-invariant gravity theories. Class.Quant.Grav. vol. 23 
21-09-2005
bullet iconClifton T and Barrow JD (2005). The Power of General Relativity. Phys.Rev.D vol. 72 
15-09-2005
bullet iconClifton T, Barrow JD and Scherrer RJ (2005). Constraints on the Variation of G from Primordial Nucleosynthesis. Phys.Rev. D vol. 71 
19-04-2005

2004

bullet iconClifton T, Mota DF and Barrow JD (2004). Inhomogeneous Gravity. Mon.Not.Roy.Astron.Soc. vol. 358 
01-06-2004

Grants

solid heart iconGrants of specific relevance to the Centre for Fundamental Physics
solid heart iconAstronomy Research at Queen Mary 2023 - 2026
Christopher Clarkson, Richard Nelson, Timothy Clifton, William Sutherland, Edward Gillen, Karim Malik, Thomas James Haworth, Sijme-Jan Paardekooper, Theresa Baker, David Mulryne, Philip Bull, Juan Antonio Valiente Kroon, Charalampos Markakis, Mohammad Mahdi Godazgar, Katherine Clough, Pau Figueras and Chung Tse Shao
£1,625,769 Science & Technology Research Council (STFC) (01-04-2023 - 30-09-2026)


solid heart iconAstronomy Research at Queen Mary 2020 - 2023
Karim Malik, Philip Bull, Christopher Clarkson, Timothy Clifton, Richard Nelson, Sijme-Jan Paardekooper and Juan Antonio Valiente Kroon
£1,868,745 Science & Technology Research Council (STFC) (01-04-2020 - 31-03-2024)