Global 21cm Absorption Signal from Superconducting Cosmic Strings

Abstract

Superconducting cosmic strings emit electromagnetic waves between the times of recombination and reionization. Hence, they have an effect on the global 21cm signal. We compute the resulting absorption features, focusing on strings with critical current, study their dependence on the string tension $\mu$, and compare with observational results. For string tensions in the range of $G\mu =10^{-10}$, where $G$ is Newton's gravitational constant, there is an interesting amplification of the two characteristic absorption features, one during the cosmic dawn, $z\lesssim 30$, and the other during the cosmic dark age, $z\sim 80$, the former being comparable in amplitude to what was observed by the EDGES experiment.

arXiv comment8 pages, 3 figures

References in corpus (38)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Cosmic strings
• An absorption profile centred at 78 megahertz in the sky-averaged spectrum
• X-ray emission from star-forming galaxies - I. High-mass X-ray binaries
• The number of cosmic string loops
• Cosmological evolution of cosmic string loops
• The Global 21 Centimeter Background from High Redshifts
• Detecting the Earliest Galaxies Through Two New Sources of 21cm Fluctuations
• Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal
• Large parallel cosmic string simulations: New results on loop production
• Enhanced global signal of neutral hydrogen due to excess radiation at cosmic dawn
• Concerns about Modelling of the EDGES Data
• Topological Defects and Structure Formation
• CMB power spectrum contribution from cosmic strings using field-evolution simulations of the Abelian Higgs model
• New limits on cosmic strings from gravitational wave observation
• Signature of Excess Radio Background in the 21-cm Global Signal and Power Spectrum
• Scaling of cosmic string loops
• The Global 21-cm Signal in the Context of the High-z Galaxy Luminosity Function
• Testing for calibration systematics in the EDGES low-band data using Bayesian model selection
• Evolution of cosmic string configurations
• Cosmic string loop distribution on all length scales and at any redshift
• A Ground Plane Artifact that Induces an Absorption Profile in Averaged Spectra from Global 21-cm Measurements - with Possible Application to EDGES
• Secondary ionization and heating by fast electrons
• Scaling from gauge and scalar radiation in Abelian Higgs string networks
• Stochastic gravitational waves from cosmic string loops in scaling
• Decoding the X-ray Properties of Pre-Reionization Era Sources
• COBE vs Cosmic Strings: An Analytical Model
• Heating of the intergalactic medium by the cosmic microwave background during cosmic dawn
• The 21 cm Signature of Cosmic String Wakes
• Formulating and critically examining the assumptions of global 21-cm signal analyses: How to avoid the false troughs that can appear in single spectrum fits
• Constraints on Superconducting Cosmic Strings from the Global $21$-cm Signal before Reionization
• Impact of Ly$\alpha$ heating on the global 21-cm signal from the Cosmic Dawn
• Type I Abelian Higgs strings: evolution and Cosmic Microwave Background constraints
• Implication of the Shape of the EDGES Signal for the 21 cm Power Spectrum
• The 21 cm Signature of Shock Heated and Diffuse Cosmic String Wakes
• The Wouthuysen Field Absorption Trough in Cosmic Strings Wakes
• The 21cm Signature of a Cosmic String Loop
• On the Possible Enhancement of the Global $21$-cm Signal at Reionization from the Decay of Cosmic String Cusps

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