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Publications Influence

Efficient computation of CMB anisotropies in closed FRW models

- A. Lewis, A. Challinor, A. Lasenby
- Physics
- 10 November 1999

We implement the efficient line-of-sight method to calculate the anisotropy and polarization of the cosmic microwave background for scalar and tensor modes in almost Friedmann-Robertson-Walker models… Expand

2,745 280- PDF

Cosmological parameters from CMB and other data: A Monte Carlo approach

We present a fast Markov chain Monte Carlo exploration of cosmological parameter space. We perform a joint analysis of results from recent cosmic microwave background ~CMB! experiments and provide… Expand

2,261 198- PDF

Weak gravitational lensing of the CMB

- A. Lewis, A. Challinor
- Physics
- 26 January 2006

Weak gravitational lensing has several important effects on the cosmic microwave background (CMB): it changes the CMB power spectra, induces non-Gaussianities, and generates a B-mode polarization… Expand

584 39- PDF

Deuterium abundance in the most metal-poor damped Lyman alpha system: converging on Ωb,0h2

- M. Pettini, B. Zych, M. Murphy, A. Lewis, C. Steidel
- Physics
- 5 May 2008

The most metal-poor damped Lyα system known to date, at zabs= 2.61843 in the spectrum of the QSO Q0913+072, with an oxygen abundance of only ∼1/250 of the solar value, shows six well-resolved DI… Expand

144 36- PDF

The linear power spectrum of observed source number counts

- A. Challinor, A. Lewis
- Physics
- 26 May 2011

We relate the observable number of sources per solid angle and redshift to the underlying proper source density and velocity, background evolution and line-of-sight potentials. We give an exact… Expand

305 20- PDF

Terrain attributes: estimation methods and scale effects

- I. Moore, A. Lewis, J. Gallant
- Environmental Science
- 4 December 1993

215 16

Efficient sampling of fast and slow cosmological parameters

- A. Lewis
- Physics
- 16 April 2013

Physical parameters are often constrained from the data likelihoods using sampling methods. Changing some parameters can be much more computationally expensive (`slow') than changing other parameters… Expand

205 16- PDF

Lensed CMB simulation and parameter estimation

- A. Lewis
- Physics
- 22 February 2005

Modelling of the weak lensing of the CMB will be crucial to obtain correct cosmological parameter constraints from forthcoming precision CMB anisotropy observations. The lensing affects the power… Expand

99 16- PDF

Cosmological parameters from WMAP 5-year temperature maps

- A. Lewis
- Physics
- 24 April 2008

I calculate a hybrid cross-power spectrum estimator from the WMAP 5-year CMB temperature maps, discuss the goodness of fit, and then constrain cosmological parameters. The spectrum and results are… Expand

60 15- PDF

CMB power spectrum parameter degeneracies in the era of precision cosmology

- C. Howlett, A. Lewis, A. Hall, A. Challinor
- Physics
- 17 January 2012

Cosmological parameter constraints from the CMB power spectra alone suffer several well-known degeneracies. These degeneracies can be broken by numerical artefacts and also a variety of physical… Expand

173 13- PDF