"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). I'm interested the theoretical models of the early universe, as well as comparing observations with cosmological models. I'm part of the core team analysing data from the Planck satellite, and a lecturer at the University of Sussex.
Key papers listed below (complete list on the
arXiv, and inSPIRE):
Rayleigh scattering: blue sky thinking for future CMB observations JCAP 08(2013)053arXiv:1307.8148
Efficient sampling of fast and slow cosmological parameters Phys. Rev. D87, 103529 (2013) arXiv:1304.4473
Planck 2013 results. XVI. Cosmological parameters arXiv:1303.5076
Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity arXiv:1303.5084
Planck 2013 results. XVII. Gravitational lensing by large-scale structure arXiv:1303.5077
The full squeezed CMB bispectrum from inflation JCAP 06(2012)023arXiv:1204.5018
CMB power spectrum parameter degeneracies in the era of precision cosmology JCAP 04(2012)027arXiv:1201.3654
CMB lensing and primordial squeezed non-Gaussianity JCAP, 03(2012)011arXiv:1201.1010
The real shape of non-Gaussianities JCAP, 10(2011)026arXiv: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)018arXiv: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 C_{l} code in CAMB.
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 Postscript
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.