Dr Timothy Clifton

Research

Research Interests:

My research interests are in relativity, gravitation, and cosmology. I am particularly interested in the large-scale behaviour of inhomogeneous spacetimes, the emergence of homogeneity and isotropy in the context of the averaging and backreaction problems, the construction of tests for determining the geometry of the Universe, and the understanding and constraining of alternative theories of gravity. As well as being of foundational importance to cosmology, the study of these areas is strongly motivated by the apparent need for the universe to be more than two thirds filled with dark energy.

Publications

Recent publication and preprints can be found here.

• Clifton T, Gallagher CS, Goldberg S et al. (2020). Viable Gauge Choices in Cosmologies with Non-Linear Structures. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.101.063530

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/63539

  
  

  Citations: 0
• Gallagher CS, Clifton T, Clarkson C (2020). Multi-scale perturbation theory. Part I. Methodology and leading-order bispectrum corrections in the matter-dominated era. nameOfConference

  
  

  DOI: 10.1088/1475-7516/2020/03/011

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/64112

  
  

  Citations: 0
• Clifton T, Sussman RA (2019). Cosmological Backreaction in Spherical and Plane Symmetric Dust-Filled Space-Times. nameOfConference

  
  

  DOI: 10.1088/1361-6382/ab3a14

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/59843

  
  

  Citations: 0
• Durk J, Clifton T (2019). Discrete Cosmological Models in the Brans-Dicke Theory of Gravity. nameOfConference

  
  

  DOI: 10.1088/1361-6382/ab329e

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/59477

  
  

  Citations: 0
• Clifton T, Sanghai VAA (2019). Parametrizing theories of gravity on large and small scales in cosmology. nameOfConference

  
  

  DOI: 10.1103/PhysRevLett.122.011301

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/54505

  
  

  Citations: 0
• Gallagher CS, Clifton T (2018). Relativistic Euler equations in cosmologies with nonlinear structures. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.98.103516

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/54815

  
  

  Citations: 0
• CLIFTON TA, Bentivegna E, DURK J et al. (2018). Black-Hole Lattices as Cosmological Models. nameOfConference

  
  

  DOI: 10.1088/1361-6382/aac846

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/42983

  
  

  Citations: 0
• Goldberg SR, Gallagher C, Clifton T (2017). Perturbation theory for cosmologies with non-linear structure. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.96.103508

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/28975

  
  

  Citations: 0
• Durk J, Clifton T (2017). A quasi-static approach to structure formation in black hole universes. nameOfConference

  
  

  DOI: 10.1088/1475-7516/2017/10/012

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/28977

  
  

  Citations: 0
• Sanghai VAA, Fleury P, Clifton T (2017). Ray tracing and Hubble diagrams in post-Newtonian cosmology. nameOfConference

  
  

  DOI: 10.1088/1475-7516/2017/07/028

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/28364

  
  

  Citations: 0
• Clifton T, Carr B, Coley A (2017). Persistent black holes in bouncing cosmologies. nameOfConference

  
  

  DOI: 10.1088/1361-6382/aa6dbb

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/32421

  
  

  Citations: 0
• Bibi R, Clifton T, Durk J (2017). Cosmological solutions with charged black holes. nameOfConference

  
  

  DOI: 10.1007/s10714-017-2261-4

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/32422

  
  

  Citations: 0
• CLIFTON TA, Durk J (2017). Exact initial data for black hole universes with a cosmological constant. nameOfConference

  
  

  DOI: 10.1088/1361-6382/aa6064

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/21339

  
  

  Citations: 0
• Clifton T, Barrow JD (2017). Decay of the Cosmic Vacuum Energy. nameOfConference

  
  

  DOI: doi

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/54506

  
  

  Citations: 0
• CLIFTON TA, Sanghai V (2017). Parameterized post-Newtonian cosmology. nameOfConference

  
  

  DOI: 10.1088/1361-6382/aa5d75

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19554

  
  

  Citations: 0
• Goldberg S, Clifton TA, Malik K (2017). Cosmology on all scales: A two-parameter perturbation expansion. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.95.043503

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19364

  
  

  Citations: 0
• Clifton T, Gregoris D, Rosquist K (2017). The Magnetic Part of the Weyl Tensor, and the Expansion of Discrete Universes. nameOfConference

  
  

  DOI: 10.1007/s10714-017-2192-0

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19131

  
  

  Citations: 0
• Clifton T, Gregoris D, Rosquist K (2017). The magnetic part of the Weyl tensor, and the expansion of discrete universes. nameOfConference

  
  

  DOI: 10.1007/s10714-017-2192-0

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/54508

  
  

  Citations: 0
• Sanghai VAA, Clifton T (2016). Cosmological backreaction in the presence of radiation and a cosmological constant. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.94.023505

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/14731

  
  

  Citations: 0
• Sanghai VAA, Clifton T (2016). Erratum: Post-Newtonian cosmological modelling (Physical Review D - Particles, Fields, Gravitation and Cosmology (2015) 91 (103532)). nameOfConference

  
  

  DOI: 10.1103/PhysRevD.93.089903

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/32423

  
  

  Citations: 0
• Sanghai VAA, Clifton T (2015). Post-Newtonian cosmological modelling. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.91.103532

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18068

  
  

  Citations: 23
• Clifton T, Dunsby PKS (2015). On the emergence of accelerating cosmic expansion in f (R) theories of gravity. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.91.103528

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17810

  
  

  Citations: 10
• Clifton T, Gregoris D, Rosquist K (2015). Applications of black hole lattices in relativistic cosmology. nameOfConference

  
  

  DOI: 10.1063/1.4937219

  
  

  QMRO: qmroHref

  
  

  Citations: 0
• Clifton T (2014). The method of images in cosmology. nameOfConference

  
  

  DOI: 10.1088/0264-9381/31/17/175010

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17811

  
  

  Citations: 15
• Clifton T, Gregoris D, Rosquist K (2014). Piecewise silence in discrete cosmological models. nameOfConference

  
  

  DOI: 10.1088/0264-9381/31/10/105012

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17812

  
  

  Citations: 21
• Clifton T, Gregoris D, Rosquist K et al. (2013). Exact Evolution of Discrete Relativistic Cosmological Models. nameOfConference

  
  

  DOI: 10.1088/1475-7516/2013/11/010

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17818

  
  

  Citations: 0
• Clifton T, Ellis GFR, Tavakol R (2013). A Gravitational Entropy Proposal. nameOfConference

  
  

  DOI: 10.1088/0264-9381/30/12/125009

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17820

  
  

  Citations: 0
• CLIFTON TA (2013). BACK-REACTION IN RELATIVISTIC COSMOLOGY. nameOfConference

  
  

  DOI: 10.1142/S0218271813300048

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17821

  
  

  Citations: 0
• CLIFTON TA (2013). G. F. R. Ellis, R. Maartens and M. A. H. MacCallum: Relativistic cosmology. nameOfConference

  
  

  DOI: 10.1007/s10714-013-1543-8

  
  

  QMRO: qmroHref

  
  

  Citations: 0
• Clifton T, Dunsby P, Goswami R et al. (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. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.87.063517

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/3762

  
  

  Citations: 0
• Clifton T, Coley A, van den Hoogen R (2012). Observational cosmology in macroscopic gravity. nameOfConference

  
  

  DOI: 10.1088/1475-7516/2012/10/044

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/3761

  
  

  Citations: 3
• Clifton T, Rosquist K, Tavakol R (2012). An exact quantification of backreaction in relativistic cosmology. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.86.043506

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17819

  
  

  Citations: 0
• Clifton T, Clarkson C, Bull P (2012). Isotropic Blackbody Cosmic Microwave Background Radiation as Evidence for a Homogeneous Universe. nameOfConference

  
  

  DOI: 10.1103/PhysRevLett.109.051303

  
  

  QMRO: qmroHref

  
  

  Citations: 18
• Clifton T, Clarkson C, Bull P (2012). The isotropic blackbody CMB as evidence for a homogeneous universe. nameOfConference

  
  

  DOI: 10.1103/PhysRevLett.109.051303

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17842

  
  

  Citations: 0
• CLIFTON TA, Bull P (2012). Local and non-local measures of acceleration in cosmology. nameOfConference

  
  

  DOI: doi

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18954

  
  

  Citations: 0
• Bull P, Clifton T (2012). Local and nonlocal measures of acceleration in cosmology. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.85.103512

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/57035

  
  

  Citations: 32
• Clifton T, Ferreira PG, Padilla A et al. (2012). Modified gravity and cosmology. nameOfConference

  
  

  DOI: 10.1016/j.physrep.2012.01.001

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17822

  
  

  Citations: 1654
• Clarkson C, Clifton T, Coley A et al. (2012). Observational constraints on the averaged universe. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.85.043506

  
  

  QMRO: qmroHref

  
  

  Citations: 23
• Clifton T, Ferreira PG, O'Donnell K (2012). Improved treatment of optics in the Lindquist-Wheeler models. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.85.023502

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17823

  
  

  Citations: 26
• CLIFTON TA, BULL, P, FERREIRA PG (2012). The kSZ effect as a test of general radial inhomogeneity in LTB cosmology. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.85.024002

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/57041

  
  

  Citations: 0
• Clifton T (2011). Cosmology without averaging. nameOfConference

  
  

  DOI: 10.1088/0264-9381/28/16/164011

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17847

  
  

  Citations: 0
• Shafieloo A, Clifton T, Ferreira P (2011). The crossing statistic: dealing with unknown errors in the dispersion of Type Ia supernovae. nameOfConference

  
  

  DOI: 10.1088/1475-7516/2011/08/017

  
  

  QMRO: qmroHref

  
  

  Citations: 18
• Clifton T (2011). Is Dark Energy an illusion?. nameOfConference

  
  

  DOI: 10.1016/j.ppnp.2011.01.004

  
  

  QMRO: qmroHref

  
  

  Citations: 1
• Clifton T, Banados M, Skordis C (2010). The parameterized post-Newtonian limit of bimetric theories of gravity. nameOfConference

  
  

  DOI: 10.1088/0264-9381/27/23/235020

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17850

  
  

  Citations: 11
• Clifton T, Zlosnik TG (2010). FRW cosmology in Milgrom's bimetric theory of gravity. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.81.103525

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17848

  
  

  Citations: 14
• Clifton T, Barrow JD (2010). Observational constraints on the completeness of space near astrophysical objects. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.81.063006

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17851

  
  

  Citations: 6
• Clifton T, Zuntz J (2009). Hubble diagram dispersion from large-scale structure. nameOfConference

  
  

  DOI: 10.1111/j.1365-2966.2009.15616.x

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17863

  
  

  Citations: 31
• Clifton T, Ferreira PG (2009). Errors in estimating Omega(Lambda) due to the fluid approximation. nameOfConference

  
  

  DOI: 10.1088/1475-7516/2009/10/026

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17849

  
  

  Citations: 28
• Clifton T, Ferreira PG (2009). Archipelagian Cosmology: Dynamics and Observables in a Universe with Discretized Matter Content. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.80.103503

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17843

  
  

  Citations: 0
• Clifton T, Ferreira PG, Zuntz J (2009). What the small angle CMB really tells us about the curvature of the Universe. nameOfConference

  
  

  DOI: 10.1088/1475-7516/2009/07/029

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17844

  
  

  Citations: 30
• Clarkson C, Clifton T, February S (2009). Perturbation theory in Lemaitre-Tolman-Bondi cosmology. nameOfConference

  
  

  DOI: 10.1088/1475-7516/2009/06/025

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17865

  
  

  Citations: 58
• Clifton T, Ferreira PG (2009). Does dark energy really exist?. nameOfConference

  
  

  DOI: 10.1038/scientificamerican0409-48

  
  

  QMRO: qmroHref

  
  

  Citations: 0
• Clifton T (2008). Higher powers in gravitation. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.78.083501

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17873

  
  

  Citations: 16
• Clifton T (2008). Properties of black hole radiation from tunnelling. nameOfConference

  
  

  DOI: 10.1088/0264-9381/25/17/175022

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17870

  
  

  Citations: 16
• Clifton T, Ferreira PG, Land K (2008). Living in a Void: Testing the Copernican Principle with Distant Supernovae. nameOfConference

  
  

  DOI: 10.1103/PhysRevLett.101.131302

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17866

  
  

  Citations: 0
• Clifton T, Weisberg JM (2008). A Simple Model for Pulse Profiles from Precessing Pulsars, with Special Application to Relativistic Binary PSR B1913+16. nameOfConference

  
  

  DOI: 10.1086/587049

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17868

  
  

  Citations: 0
• Clifton T (2008). Parametrized post-Newtonian limit of fourth-order theories of gravity. nameOfConference

  
  

  DOI: 10.1103/PhysRevD.77.024041

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17872

  
  

  Citations: 45
• Clifton T (2007). Exact Friedmann solutions in higher-order gravity theories. nameOfConference

  
  

  DOI: 10.1088/0264-9381/24/20/010

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17878

  
  

  Citations: 0
• Clifton T, Shenker S, Sivanandam N (publicationYear). Volume weighted measures of eternal inflation in the Bousso-Polchinski landscape. nameOfConference

  
  

  DOI: 10.1088/1126-6708/2007/09/034

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18032

  
  

  Citations: 0
• Clifton T, Barrow JD (publicationYear). Ups and downs of cyclic universes. nameOfConference

  
  

  DOI: 10.1103/physrevd.75.043515

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17879

  
  

  Citations: 0
• Clifton T, Linde A, Sivanandam N (publicationYear). Islands in the landscape. nameOfConference

  
  

  DOI: 10.1088/1126-6708/2007/02/024

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17891

  
  

  Citations: 0
• Clifton T (2006). Spherically symmetric solutions to fourth-order theories of gravity. nameOfConference

  
  

  DOI: 10.1088/0264-9381/23/24/015

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/17890

  
  

  Citations: 0
• Barrow JD, Clifton T (publicationYear). Cosmologies with energy exchange. nameOfConference

  
  

  DOI: 10.1103/physrevd.73.103520

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18030

  
  

  Citations: 0
• Clifton T, Barrow JD (publicationYear). Decaying gravity. nameOfConference

  
  

  DOI: 10.1103/physrevd.73.104022

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18042

  
  

  Citations: 0
• Clifton T, Barrow JD (2006). Further exact cosmological solutions to higher-order gravity theories. nameOfConference

  
  

  DOI: 10.1088/0264-9381/23/9/011

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18044

  
  

  Citations: 0
• Clifton T, Barrow JD (publicationYear). The existence of Gödel, Einstein, and de Sitter universes. nameOfConference

  
  

  DOI: 10.1103/physrevd.72.123003

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18065

  
  

  Citations: 0
• Barrow JD, Clifton T (2006). Exact cosmological solutions of scale-invariant gravity theories. nameOfConference

  
  

  DOI: 10.1088/0264-9381/23/1/l01

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18067

  
  

  Citations: 0
• Clifton T, Barrow JD (publicationYear). The power of general relativity. nameOfConference

  
  

  DOI: 10.1103/physrevd.72.103005

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18045

  
  

  Citations: 0
• Clifton T, Barrow JD, Scherrer RJ (publicationYear). Constraints on the variation ofGfrom primordial nucleosynthesis. nameOfConference

  
  

  DOI: 10.1103/physrevd.71.123526

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18066

  
  

  Citations: 0
• Clifton T, Mota DF, Barrow JD (2005). Inhomogeneous gravity. nameOfConference

  
  

  DOI: 10.1111/j.1365-2966.2005.08831.x

  
  

  QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/18046

  
  

  Citations: 102

Supervision

This is not an exhaustive list and I would be happy to discuss other project possibilities.