Welcome

As a postdoctoral research associate at the University of Edinburgh, I specialise in testing gravity on ten to hundreds of megaparsecs with spectroscopic redshift surveys; I've had the pleasure of leading a VIPERS redshift-space distortions working group to this end. You may read more about my work in the following. Please email me: mjw@roe.ac.uk if you have any questions.

VIPERS

I have proven the expansion history and linear growth rate predicted by General Relativity to be consistent with the VIPERS PDR-2 power spectrum, when a Planck (2015) cosmology is assumed. Moreover, we investigated the effect of density weighting prior to the analysis, which would amplify signatures of shielded modified gravity; the validity of perturbation theory is extended as a bonus.

ACT

I, together with B. Sherwin, C. Hill and the Atacama Cosmology Telescope team made the first detection of non-Gaussianity of the cosmic microwave background due to the thermal Sunyaev-Zel'dovich effect. Using the observed skewness, we placed an independent constraint on the root-mean-square density fluctuation once smoothed on 8$h^{-1}$Mpc scales.

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Masked redshift-space distortions

The dominant systematic of the large-scale power spectrum is due to the survey mask. I've developed a 1000-10,000x faster method to account for this, which forms the basis of my own analysis and that of BOSS DR12.

Thesis

My thesis was supervised by J. Peacock, A. Taylor and S. de la Torre; S. Cole and A. Lawrence were my opponents during the viva.

Curriculum vitae

My academic and research history.

The future

I intend to develop more accurate models for density-weighted clustering statistics, in order to better understand how this may refute the shielding mechanism. I am open to collaboration on a broad range of topics in cosmology; in particular, measuring the linear growth rate with the kinetic Sunyaev-Zel'dovich effect.