Searching for cosmic strings in CMB anisotropy maps using wavelets and curvelets

L Hergt, A Amara, R Brandenberger… - … of Cosmology and …, 2017 - iopscience.iop.org
We use wavelet and curvelet transforms to extract signals of cosmic strings from simulated
cosmic microwave background (CMB) temperature anisotropy maps, and to study the limits …

Clustering of local extrema in Planck CMB maps

A Vafaei Sadr, SMS Movahed - Monthly Notices of the Royal …, 2021 - academic.oup.com
The clustering of local extrema will be exploited to examine Gaussianity, asymmetry, and the
footprint of the cosmic-string network on the CMB observed by Planck. The number density …

All sky CMB map from cosmic strings integrated Sachs-Wolfe effect

C Ringeval, FR Bouchet - Physical Review D—Particles, Fields, Gravitation …, 2012 - APS
By actively distorting the cosmic microwave background (CMB) over our past light cone,
cosmic strings are unavoidable sources of non-Gaussianity. Developing optimal estimators …

Wavelet-Bayesian inference of cosmic strings embedded in the cosmic microwave background

JD McEwen, SM Feeney, HV Peiris… - Monthly Notices of …, 2017 - academic.oup.com
Cosmic strings are a well-motivated extension to the standard cosmological model and
could induce a subdominant component in the anisotropies of the cosmic microwave …

A Multiscale pipeline for the search of string-induced CMB anisotropies

A Vafaei Sadr, SMS Movahed… - Monthly Notices of …, 2018 - academic.oup.com
We propose a multiscale edge-detection algorithm to search for the Gott–Kaiser–Stebbins
imprints of a cosmic string (CS) network on the cosmic microwave background (CMB) …

Cosmic string detection with tree-based machine learning

A Vafaei Sadr, M Farhang… - Monthly Notices of …, 2018 - academic.oup.com
We explore the use of random forest and gradient boosting, two powerful tree-based
machine learning algorithms, for the detection of cosmic strings in maps of the cosmic …

Long-range correlation in cosmic microwave background radiation

MS Movahed, F Ghasemi, S Rahvar, MRR Tabar - Physical Review E …, 2011 - APS
We investigate the statistical anisotropy and Gaussianity of temperature fluctuations of
Cosmic Microwave Background (CMB) radiation data from the Wilkinson Microwave …

Probing the Anisotropy and Non-Gaussianity in the Redshift Space through the Conditional Moments of the First Derivative

MHJ Kanafi, SMS Movahed - The Astrophysical Journal, 2024 - iopscience.iop.org
Focusing on the redshift space observations with plane-parallel approximation and relying
on the rotational dependency of the general definition of excursion sets, we introduce the so …

Probing the anisotropy and non-Gaussianity in redshift space through the derivative of excursion set moments

MH Kanafi, SMS Movahed - arXiv preprint arXiv:2308.03086, 2023 - arxiv.org
Focusing on the redshift space observations with plane-parallel approximation and relying
on the rotational dependency of the general definition of excursion sets, we introduce the so …

Inferring cosmic string tension through the neural network prediction of string locations in CMB maps

R Ciuca, OF Hernández - Monthly Notices of the Royal …, 2019 - academic.oup.com
In previous work, we constructed a convolutional neural network used to estimate the
location of cosmic strings in simulated cosmic microwave background temperature …