Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Fergusson, J R"'
Publikováno v:
Phys. Rev. D 95, 043532 (2017)
The direct evaluation of manifestly optimal, cut-sky CMB power spectrum and bispectrum estimators is numerically very costly, due to the presence of inverse-covariance filtering operations. This justifies the investigation of alternative approaches.
Externí odkaz:
http://arxiv.org/abs/1510.03103
We present a case study describing efforts to optimise and modernise "Modal", the simulation and analysis pipeline used by the Planck satellite experiment for constraining general non-Gaussian models of the early universe via the bispectrum (or three
Externí odkaz:
http://arxiv.org/abs/1503.08809
Publikováno v:
Phys. Rev. D 91, 123506 (2015)
We undertake a thorough search for signatures of sharp oscillatory features in the WMAP9 power spectrum and bispectrum as well as in the Planck power spectrum. For the first time, we carry out searches in both the power spectrum and bispectrum simult
Externí odkaz:
http://arxiv.org/abs/1412.6152
Publikováno v:
Phys. Rev. D 91, 023502 (2015)
The simplest inflationary models present us with few observable parameters to discriminate between them. A detection of features in the spectra of primordial density perturbations could provide valuable insights and lead to stringent tests of models
Externí odkaz:
http://arxiv.org/abs/1410.5114
Autor:
Fergusson, J. R.
Publikováno v:
Phys. Rev. D 90, 043533 (2014)
In this paper we demonstrate an efficient method for including both CMB temperature and polarisation data in optimal non-Gaussian estimators. The method relies on orthogonalising the multipoles of the temperature and polarisation maps and results in
Externí odkaz:
http://arxiv.org/abs/1403.7949
In this paper we present the implementation of an efficient formalism for the generation of arbitrary non-Gaussian initial conditions for use in N-body simulations. The methodology involves the use of a separable modal approach for decomposing a prim
Externí odkaz:
http://arxiv.org/abs/1108.3813
Autor:
Fergusson, J. R., Shellard, E. P. S.
We show that full inverse covariance weighting can be naturally incorporated into modal estimation methods making them optimal for the CMB power spectrum, bispectrum and trispectrum, as well as in other 3D applications. Modal estimation methods are h
Externí odkaz:
http://arxiv.org/abs/1105.2791
We present an implementation of an optimal CMB trispectrum estimator which accounts for anisotropic noise and incomplete sky coverage. We use a general separable mode expansion which can and has been applied to constrain both primordial and late-time
Externí odkaz:
http://arxiv.org/abs/1012.6039
We present an efficient separable approach to the estimation and reconstruction of the bispectrum and the trispectrum from observational (or simulated) large scale structure data. This is developed from general CMB (poly-)spectra methods which exploi
Externí odkaz:
http://arxiv.org/abs/1008.1730
We use a separable mode expansion estimator with WMAP data to estimate the bispectrum for all the primary families of non-Gaussian models. We review the late-time mode expansion estimator methodology which can be applied to any non-separable primordi
Externí odkaz:
http://arxiv.org/abs/1006.1642