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Pevensey III, room 4C7
Sussex Astronomy

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Physics and Cosmology

"Those of us engaged in scientific research generally do it because we can't help it - because Nature is the biggest and most complicated jumbo holiday crossword puzzle you have ever seen" - Ed Hinds, New Scientist Sept. 1997

I am currently working on aspects of cosmology, particularly the Cosmic Microwave Background (CMB - the radiation left over from the big bang) and how it is gravitationally lensed. I'm interested the theoretical models of the early universe, as well as comparing observations with cosmological models. I was part of the core team analysing data from the Planck satellite and now part of the Simons Observatory collaboration (amongst others). I'm a professor at the University of Sussex,

Key papers listed below (complete list on the arXiv, and inSPIRE):
  • How to detect lensing rotation
  • CMB lensing from Planck PR4 maps
  • Cobaya: Code for Bayesian Analysis of hierarchical physical models
  • CMB lensing reconstruction biases in cross-correlation with large-scale structure probes
  • Planck 2018 results. VIII. Gravitational lensing
  • Planck 2018 results. VI. Cosmological parameters
  • Emission-angle and polarization-rotation effects in the lensed CMB
  • Internal delensing of Planck CMB temperature and polarization
  • Impact of post-Born lensing on the CMB
  • Planck 2015 results. XIII. Cosmological parameters
  • Planck 2015 results. XV. Gravitational lensing
  • Rayleigh scattering: blue sky thinking for future CMB observations
    JCAP 08(2013)053 arXiv:1307.8148
  • Efficient sampling of fast and slow cosmological parameters
    Phys. Rev. D87, 103529 (2013) arXiv:1304.4473
  • Planck 2013 results. XVI. Cosmological parameters
  • Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity
  • Planck 2013 results. XVII. Gravitational lensing by large-scale structure
  • The full squeezed CMB bispectrum from inflation
    JCAP 06(2012)023 arXiv:1204.5018
  • CMB power spectrum parameter degeneracies in the era of precision cosmology
    JCAP 04(2012)027 arXiv:1201.3654
  • CMB lensing and primordial squeezed non-Gaussianity
    JCAP, 03(2012)011 arXiv:1201.1010
  • The real shape of non-Gaussianities
    JCAP, 10(2011)026 arXiv:1107.5431
  • The linear power spectrum of observed source number counts
    Phys. Rev. D84, 043516 (2011) arXiv:1105.5292. See CAMB sources.
  • The shape of the CMB lensing bispectrum
    JCAP, 03(2011)018 arXiv:1101.2234
  • Massive Neutrinos and Magnetic Fields in the Early Universe
    Phys. Rev. D81, 043517 (2010) arXiv:0911.2714
  • Estimators for CMB Statistical Anisotropy
    Phys. Rev. D80, 063004 (2009) arXiv:0908.0963
  • Non-linear Redshift-Space Power Spectra
    Phys. Rev. D78, 103512 (2008) arXiv:0808.1724
  • Likelihood Analysis of CMB Temperature and Polarization Power Spectra
    Phys. Rev. D77, 103013 (2008). arXiv:0801.0554
  • The 21cm angular-power spectrum from the dark ages
    Phys. Rev. D76, 083005 (2007). astro-ph/0702600. See CAMB sources.
  • Linear effects of perturbed recombination
    Phys. Rev. D76, 063001 (2007). arXiv:0707.2727
  • Weak Gravitational Lensing of the CMB
    Phys. Rept. 429, 1-65 (2006), astro-ph/0601594
  • Cluster masses from CMB and galaxy weak lensing
    Phys. Rev. D73, 063006 (2006). astro-ph/0512104
  • Lensed CMB power spectra from all-sky correlation functions
    Phys. Rev. D71, 103010 (2005). astro-ph/0502425. Lensed Cl code in CAMB.
  • Lensed CMB simulation and parameter estimation
    Phys. Rev. D71, 083008 (2005). astro-ph/0502469. LensPix code.
  • CMB anisotropies from primordial inhomogeneous magnetic fields
    Phys. Rev. D70, 043011 (2004). astro-ph/0406096. Vector mode code now in CAMB
  • Observable primordial vector modes
    Phys. Rev. D70, 043518 (2004). astro-ph/0403583. Additional material.
  • Large Scale CMB Anisotropies and Dark Energy
    MNRAS 346, 987-993 (2003). astro-ph/0307104.
  • Harmonic E/B decomposition for CMB polarization maps
    Phys. Rev. D68, 083509 (2003). astro-ph/0305545. Download sample code. Additional plots.
  • Observational constraints on the curvaton model of inflation
    Phys. Rev. D67, 123513 (2003) astro-ph/0212248.
  • Cosmological parameters from CMB and other data: a Monte-Carlo approach
    Phys. Rev. D66, 103511 (2002) astro-ph/0205436. See the CosmoMC home page.
  • Evolution of cosmological dark matter perturbations
    Phys. Rev. D66, 023531 (2002) astro-ph/0203507
  • Closed Universes from Cosmological Instantons
    Phys. Rev. D65, 043513 (2002). astro-ph/0111012
  • Analysis of CMB polarization on an incomplete sky
    Phys. Rev. D65, 023505 (2002). astro-ph/0106536 (Short version). Download sample code.
  • Efficient computation of CMB anisotropies is closed FRW models.
    Ap. J. 538:473-476, (2000). astro-ph/9911177. See the CAMB home page.
  • Quadratic Lagrangians and Topology in Gauge Theory Gravity
    GRG 32:1, 161 (2000). gr-qc/9910039.
  • Electron Scattering in the Spacetime Algebra
    In Clifford Algebras and their applications in mathematical physics vol. 1, eds. R. Ablamowicz and B. Fauser, 2000. Postscript
  • Electron scattering without spin sums
    Int. J. Theor. Phys. 40(1) (2001)

My PhD was with Anthony Lasenby at the Cavendish, Cambridge on applications of Geometric Algebra and covariant methods in physics. GA is unifying mathematical framework for dealing with geometric objects, subsuming vector calculus, complex analysis, tensor calculus, differential forms, and more. I've written an introduction to the subject which I hope should be quite accessible and is now the second chapter of my thesis. Download a PDF copy.

After my three years of PhD I spent two years postdoc at DAMTP in Cambridge. It then spent 2 and a half years at CITA, University of Toronto and 4 months at the CfA, Harvard. On returning to the UK I spent four-and-a-bit years in the Cambridge Institute of Astronomy/KICC as an STFC Advanced fellow before getting my current position in Sussex.