Updated constraints on superconducting cosmic strings from the astronomy of fast radio bursts

Imtiaz, Batool; Shi, Rui; Cai, Yi-Fu

doi:10.1140/epjc/s10052-020-8064-x

Cited by 8 publications

(4 citation statements)

References 49 publications

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“…More recently, CCCSs were investigated in refs. [51][52][53][54][55][56][57]. The evolution of standard Nambu-Goto strings can be conveniently described by the so-called velocity-dependent one-scale (VOS) model [58,59], which allows one to track the evolution of two important properties of the string network: its correlation length and the root-mean-square velocity of long strings.…”

Section: Jcap04(2023)009mentioning

confidence: 99%

Gravitational waves from current-carrying cosmic strings

Auclair

Blasi

Brdar

et al. 2023

J. Cosmol. Astropart. Phys.

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Cosmic strings are predicted by many Standard Model extensions involving the cosmological breaking of a symmetry with nontrivial first homotopy group and represent a potential source of primordial gravitational waves (GWs). Present efforts to model the GW signal from cosmic strings are often based on minimal models, such as, e.g., the Nambu-Goto action that describes cosmic strings as exactly one-dimensional objects without any internal structure. In order to arrive at more realistic predictions, it is therefore necessary to consider nonminimal models that make an attempt at accounting for the microscopic properties of cosmic strings. With this goal in mind, we derive in this paper the GW spectrum emitted by current-carrying cosmic strings (CCCSs), which may form in a variety of cosmological scenarios. Our analysis is based on a generalized version of the velocity-dependent one-scale (VOS) model, which, in addition to the mean velocity and correlation length of the string network, also describes the evolution of a chiral (light-like) current. As we are able to show, the solutions of the VOS equations imply a temporarily growing fractional cosmic-string energy density, Ωcs. This results in an enhanced GW signal across a broad frequency interval, whose boundaries are determined by the times of generation and decay of cosmic-string currents. Our findings have important implications for GW experiments in the Hz to MHz band and motivate the construction of realistic particle physics models that give rise to large currents on cosmic strings.

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Section: Jcap04(2023)009mentioning

confidence: 99%

Gravitational waves from current-carrying cosmic strings

Auclair

Blasi

Brdar

et al. 2023

J. Cosmol. Astropart. Phys.

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“…There are also Gµ measurements and forecasts from other observational routes. For example see Ringeval & Suyama (2017) Kuroyanagi et al (2013) for bounds on string loops from pulsar timing constraints on the amplitude of the stochastic gravitational wave background, Imtiaz et al (2020) for bounds on CS network from fast radio bursts, Brandenberger et al (2010); Hernandez & Brandenberger (2012); Pagano & Brandenberger (2012) for forecasts from 21-cm signatures, Laliberte & Brandenberger (2020) for CS imprints on ionization fraction in the Universe, Fernandez et al (2020) for the effect of CS on the filament structure in the cosmic web and Cunha et al (2018) for the imprint of CSs on the dark matter distribution.…”

Section: )mentioning

confidence: 99%

Planck Limits on Cosmic String Tension Using Machine Learning

Torki,

Hajizadeh,

Farhang

et al. 2021

Preprint

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We develop two parallel machine-learning pipelines to estimate the contribution of cosmic strings (CSs), conveniently encoded in their tension (Gµ), to the anisotropies of the cosmic microwave background radiation observed by Planck. The first approach is tree-based and feeds on certain map features derived by image processing and statistical tools. The second uses convolutional neural network with the goal to explore possible non-trivial features of the CS imprints. The two pipelines are trained on Planck simulations and when applied to Planck SMICA map yield the 3σ upper bound of Gµ 8.6 × 10 −7 . We also train and apply the pipelines to make forecasts for futuristic CMB-S4-like surveys and conservatively find their minimum detectable tension to be Gµ min ∼ 1.9 × 10 −7 .

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“…Although for current-carrying strings, there may be an additional observational channel -electromagnetic radiation [40][41][42], -the current traveling along the cosmic strings may be coupled with the hidden sector [43][44][45][46][47][48] and they may not generate electromagnetic signals as a result. The emission of gravitational radiation, on the other hand, should occur independently of the nature of the current and may then allow us to study a large variety of string-forming scenarios.…”

Section: Introductionmentioning

confidence: 99%

Emission of gravitational waves by superconducting cosmic strings

Rybak

Sousa

2022

J. Cosmol. Astropart. Phys.

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We study the gravitational radiation emission efficiency Γ of superconducting cosmic strings. We demonstrate, by using a solvable model of transonic strings, that the presence of a current leads to a suppression of the gravitational emission of cusps, kinks and different types of loops. We also show that, when a current is present, the spectrum of emission of loops with cusps is exponentially suppressed as the harmonic mode increases, thus being significantly different from the power law spectrum of currentless loops. Furthermore, we establish a phenomenological relationship between Γ and the value of the current on cosmic strings. We conjecture that this relation should be valid for an arbitrary type of current-carrying string. We use this result to study the potential impact of current on the stochastic gravitational wave background generated by cosmic strings with additional degrees of freedom and show that both the amplitude and shape of the spectrum may be significantly affected.

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Updated constraints on superconducting cosmic strings from the astronomy of fast radio bursts

Cited by 8 publications

References 49 publications

Gravitational waves from current-carrying cosmic strings

Gravitational waves from current-carrying cosmic strings

Planck Limits on Cosmic String Tension Using Machine Learning

Emission of gravitational waves by superconducting cosmic strings

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