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pro vyhledávání: '"Creswell, James"'
Shell models provide a simplified mathematical framework that captures essential features of incompressible fluid turbulence, such as the energy cascade and scaling of the fluid observables. We perform a precision analysis of the direct and inverse c
Externí odkaz:
http://arxiv.org/abs/2409.11898
Shell model turbulence is a simplified mathematical framework that captures essential features of incompressible fluid turbulence such as the energy cascade, intermittency and anomalous scaling of the fluid observables. We perform a precision analysi
Externí odkaz:
http://arxiv.org/abs/2402.07813
In this work, we point out that the Q/U Stokes parameters and E/B mode polarizations are the four components of a unique quaternion, which describes at the same time the directions and the parity states of spherical linear polarizations. We then poin
Externí odkaz:
http://arxiv.org/abs/2204.04814
Autor:
Creswell, James, Naselsky, Pavel
The largest anisotropy in the cosmic microwave background (CMB) is the 3 mK kinematic dipole reflecting our motion with respect to the CMB frame and pointed in the direction $(l, b) = (264^\circ, +48^\circ)$ in Galactic coordinates. We introduce the
Externí odkaz:
http://arxiv.org/abs/2105.08658
Autor:
Creswell, James, Naselsky, Pavel
We investigate the sources of parity asymmetry in the CMB temperature maps using a pixel domain approach. We demonstrate that this anomaly is mainly associated with the presence of two pairs of high asymmetry regions. The first pair of peaks with Gal
Externí odkaz:
http://arxiv.org/abs/2102.13442
Publikováno v:
Phys. Rev. D 104, 023502 (2021)
The non-polarized points (NPP) of the $Q$ and $U$ Stokes parameters of the CMB can be classified according to the geometry of the polarization field. We describe a procedure to identify these points in the pixelized sky and present the shape of the p
Externí odkaz:
http://arxiv.org/abs/2012.15811
We examine the statistical properties of polarization maps from Planck 2018 within the patch of sky observed by the BICEP2/Keck experiment using the one point distribution function (1PDF), skewness, and kurtosis statistics. Our analysis is performed
Externí odkaz:
http://arxiv.org/abs/2005.03170
We study the distribution functions of the CMB polarization angle $\psi$, focusing on the Planck 2018 CMB maps. We extend the model of Preece & Battye (2014) of Gaussian correlated $Q$ and $U$ Stokes parameters to allow nonzero means. When the varian
Externí odkaz:
http://arxiv.org/abs/2001.01757
Publikováno v:
JCAP05(2019)003
In CMB science, the simplest idea to remove a contaminated sky region is to multiply the sky map with a mask that is 0 for the contaminated region and 1 elsewhere, which is also called a top-hat masking. Although it is easy to use, such top-hat maski
Externí odkaz:
http://arxiv.org/abs/1904.04124
Publikováno v:
JCAP04(2019)046
We study the problem of EB-leakage that is associated with incomplete polarized CMB sky. In the blind case that assumes no additional information about the statistical properties and amplitudes of the signal from the missing sky region, we prove that
Externí odkaz:
http://arxiv.org/abs/1904.00451