Cosmological fluid dynamics in the Schr\"odinger formalism (2009)
Johnston, Rebecca, Lasenby, A. N., Hobson, M. P.
We investigate the dynamics of a cosmological dark matter fluid in the Schr\"odinger formulation, seeking to evaluate the approach as a potential tool for theorists. We find simple wave-mechanical...
Bayesian optimal reconstruction of the primordial power spectrum (2008)
Bridges, M., Feroz, F., Hobson, M. P., Lasenby, A. N.
The form of the primordial power spectrum has the potential to differentiate strongly between competing models of perturbation generation in the early universe and so is of considerable importance....
An excess of emission in the dark cloud LDN 1111 with the Arcminute Microkelvin Imager (2008)
Hurley-Walker, N., Green, D. A., Davies, M. L., Grainge, K. J. B., Hobson, M. P., ...
We present observations of the Lynds' dark nebula LDN 1111 made at microwave frequencies between 14.6 and 17.2 GHz with the Arcminute Microkelvin Imager (AMI). We find emission in this frequency band...
Brechet, S. D., Hobson, M. P., Lasenby, A. N.
A dynamical analysis of an effective homogeneous and irrotational Weyssenhoff fluid in general relativity is performed using the 1+3 covariant approach that enables the dynamics of the fluid to be...
McEwen, J. D., Hobson, M. P., Lasenby, A. N., Mortlock, D. J.
We repeat the directional spherical real Morlet wavelet analysis, used to detect non-Gaussianity in the Wilkinson Microwave Anisotropy Probe (WMAP) 1-year and 3-year data (McEwen et al. 2005, 2006a),...
S. L. Bridle, M. P. Hobson, A. N. Lasenby, O. Lahav, G. Rocha
Observations of large scale structure (LSS) and the Cosmic Microwave Background (CMB) each place separate constraints on the values of cosmological parameters. We calculate a joint likelihood based...
A low CMB variance in the WMAP data (2007)
Monteserin, C., Barreiro, R. B., Vielva, P., Martinez-Gonzalez, E., Hobson, M. P., Lasenby, A. N.
We have estimated the CMB variance from the three-year WMAP data, finding a value which is significantly lower than the one expected from Gaussian simulations using the WMAP best-fit cosmological...
Weyssenhoff fluid dynamics in general relativity using a 1+3 covariant approach (2007)
Brechet, S. D., Hobson, M. P., Lasenby, A. N.
The Weyssenhoff fluid is a perfect fluid with spin where the spin of the matter fields is the source of torsion in an Einstein-Cartan framework. Obukhov and Korotky showed that this fluid can be...
Cosmological applications of a wavelet analysis on the sphere (2007)
McEwen, J. D., Vielva, P., Wiaux, Y., Barreiro, R. B., Cayón, L., Hobson, M. P., ...
The cosmic microwave background (CMB) is a relic radiation of the Big Bang and as such it contains a wealth of cosmological information. Statistical analyses of the CMB, in conjunction with other...
Optimal filters on the sphere (2006)
McEwen, J. D., Hobson, M. P., Lasenby, A. N.
We derive optimal filters on the sphere in the context of detecting compact objects embedded in a stochastic background process. The matched filter and the scale adaptive filter are derived on the...
Markov chain Monte Carlo analysis of Bianchi VII_h models (2006)
Bridges, M., McEwen, J. D., Lasenby, A. N., Hobson, M. P.
We have extended the analysis of Jaffe et al. to a complete Markov chain Monte Carlo (MCMC) study of the Bianchi type ${\rm VII_h}$ models including a dark energy density, using 1-year and 3-year...
McEwen, J. D., Vielva, P., Hobson, M. P., Martinez-Gonzalez, E., Lasenby, A. N.
Using a directional spherical wavelet analysis we detect the integrated Sachs-Wolfe (ISW) effect, indicated by a positive correlation between the first-year Wilkinson Microwave Anisotropy Probe...
A Bayesian analysis of the primordial power spectrum (2005)
Bridges, M., Lasenby, A. N., Hobson, M. P.
We present a Bayesian analysis of large-scale structure and cosmic microwave background data to constrain the form of the primordial power spectrum. We have extended the usual presumption of a scale...
McEwen, J. D., Hobson, M. P., Lasenby, A. N., Mortlock, D. J.
Many of the current anomalies reported in the Wilkinson Microwave Anisotropy Probe (WMAP) 1-year data disappear after `correcting' for the best-fit embedded Bianchi type VII_h component (Jaffe et al....
New Geometric Methods for Computer Vision: an application to structure and motion estimation (1998)
. We discuss a coordinate-free approach to the geometry of computer vision problems. The technique we use to analyse the 3-dimensional transformations involved will be that of geometric algebra: a...