Lensing reconstruction from PLANCK sky maps: inhomogeneous noise (2009)
Hanson, Duncan, Rocha, Graca, Gorski, Krzysztof
We discuss the effects of inhomogeneous sky-coverage on CMB lens reconstruction, focusing on application to the recently launched Planck satellite. We discuss the mean-field which is induced by noise...
Observing the Evolution of the Universe (2009)
Aguirre, James, Amblard, Alexandre, Ashoorioon, Amjad, Baccigalupi, Carlo, Balbi, Amedeo, Bartlett, James, ...
How did the universe evolve? The fine angular scale (l>1000) temperature and polarization anisotropies in the CMB are a Rosetta stone for understanding the evolution of the universe. Through detailed...
Carvalho, Pedro, Rocha, Graca, Hobson, M. P.
A new fast Bayesian approach is introduced for the detection of discrete objects immersed in a diffuse background. This new method, called PowellSnakes, speeds up traditional Bayesian techniques by:...
Constraints on the Cosmological Parameters using CMB observations (2007)
. This paper covers several techniques of intercomparison of Cosmic Microwave Background (CMB) anisotropy experiments and models of structure formation. It presents the constraints on several...
Smith, Sarah, Challinor, Anthony, Rocha, Graca
The effect of weak gravitational lensing on the cosmic microwave background (CMB) temperature anisotropies and polarization will provide access to cosmological information that cannot be obtained...
Simulation of non-Gaussian CMB maps (2004)
Rocha, Graca, Hobson, M. P., Smith, Sarah, Ferreira, Pedro, Challinor, Anthony
A simple method is presented for the rapid simulation of statistically-isotropic non-Gaussian maps of CMB temperature fluctuations with a given power spectrum and analytically-calculable bispectrum...
Non-Random Phases in Non-Trivial Topologies (2004)
Dineen, Patrick, Rocha, Graca, Coles, Peter
We present a new technique for constraining the topology of the universe. The method exploits the existence of correlations in the phases of the spherical harmonic coefficients of the CMB temperature...
Estimating the bispectrum of the Very Small Array data (2004)
Smith, Sarah, Rocha, Graca, Challinor, Anthony, Battye, Richard A., Carreira, Pedro, Cleary, Kieran, ...
We estimate the bispectrum of the Very Small Array data from the compact and extended configuration observations released in December 2002, and compare our results to those obtained from Gaussian...
Searching for non-Gaussianity in the VSA data (2003)
Savage, Richard, Battye, Richard A., Carreira, Pedro, Cleary, Kieran, Davies, Rod D., Davis, Richard J., ...
We have tested Very Small Array (VSA) observations of three regions of sky for the presence of non-Gaussianity, using high-order cumulants, Minkowski functionals, a wavelet-based test and a Bayesian...
Mukherjee, Pia, Ganga, Ken, Ratra, Bharat, Rocha, Graca, Souradeep, Tarun, Sugiyama, Naoshi, ...
We use joint likelihood analyses of combinations of fifteen cosmic microwave background (CMB) anisotropy data sets from the DMR, UCSB South Pole 1994, Python I--III, ARGO, MAX 4 and 5, White Dish,...
Bayesian joint estimation of non-Gaussianity and the power spectrum (2000)
Rocha, Graca, Magueijo, Joao, Hobson, Mike, Lasenby, Anthony
We propose a rigorous, non-perturbative, Bayesian framework which enables one jointly to test Gaussianity and estimate the power spectrum of CMB anisotropies. It makes use of the Hilbert space of an...
Constraints on the Cosmological Parameters using CMB observations (1999)
This paper covers several techniques of intercomparison of Cosmic Microwave Background (CMB) anisotropy experiments and models of structure formation. It presents the constraints on several...
Rocha, Graca, Stompor, Radoslaw, Ganga, Ken, Ratra, Bharat, Platt, Stephen R., Sugiyama, Naoshi, ...
We use Python I, II, and III cosmic microwave background anisotropy data to constrain cosmogonies. We account for the Python beamwidth and calibration uncertainties. We consider open and...
Ratra, Bharat, Stompor, Radoslaw, Ganga, Ken, Rocha, Graca, Sugiyama, Naoshi, Gorski, Krzysztof M.
We use combinations of ten small-scale cosmic microwave background anisotropy data sets from the UCSB South Pole 1994, ARGO, MAX 4 and 5, White Dish and SuZIE experiments to constrain cosmogonies. We...
Joint estimation of cosmological parameters from CMB and IRAS data (1998)
Webster, Matthew, Bridle, S. L., Hobson, M. P., Lasenby, A. N., Lahav, Ofer, Rocha, Graca
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 first determination of the position of the `Doppler' peak (1996)
Hancock, Stephen, Rocha, Graca
Cosmological theories for the origin and evolution of structure in the Universe are highly predictive of the form of the angular power spectrum of cosmic microwave background fluctuations. We present...
Theoretical implications of microwave background radiation anisotropy experiments (1996)
Rocha, Graca, Hancock, Stephen
Observational results from several experiments such as COBE, SP, Saskatoon, PYTHON, ARGO, MAX, MSAM, Tenerife and CAT are considered and a comparison is made with predictions from several models....