Weak lensing of CMB by cosmic (super-)strings

Abstract

We study the effect of weak lensing by cosmic (super-)strings on the anisotropies of cosmic microwave background (CMB). In developing a method to calculate the lensing convergence field due to strings, and thereby temperature and polarization angular power spectra of CMB, we clarify how the nature of strings, characterized by the intercommuting probability, can influence these CMB anisotropies. Assuming that the power spectrum is dominated by Poisson-distributed string segments, we find that the convergence spectrum peaks at low multipoles and is mostly contributed from strings located at relatively low redshifts. As the intercommuting probability decreases, the spectra of the convergence and hence the lensed temperature and polarizations are gained because the number density of string segments becomes larger. An observationally important feature of the string-induced CMB polarizations is that the string-lensed spectra decay more slowly on small scales compared with primordial scalar perturbations from standard inflation.

11 pages, 8 figures; v2: references added, v3: accepted for publication in Physical Review D

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• ACTPol: A polarization-sensitive receiver for the Atacama Cosmology Telescope
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Cited by in corpus (11)

• Bias-Hardened CMB Lensing
• Wave Effect in Gravitational Lensing by the Ellis Wormhole
• Full-sky lensing reconstruction of gradient and curl modes from CMB maps
• Probing Cosmic Superstrings with Gravitational Waves
• BICEP / Keck XVII: Line of Sight Distortion Analysis: Estimates of Gravitational Lensing, Anisotropic Cosmic Birefringence, Patchy Reionization, and Systematic Errors
• Weak lensing generated by vector perturbations and detectability of cosmic strings
• Type-I cosmic string network
• Thermodynamics of Cosmic Defect Network Evolution
• Femto-lensing due to a Cosmic String
• CMB ISW-lensing bispectrum from cosmic strings
• Weak lensing from self-ordering scalar fields