Revisiting Y junctions for strings with currents: Transonic elastic case

Rybak, I. Yu.

doi:10.1103/physrevd.102.083516

Cited by 4 publications

(5 citation statements)

References 55 publications

(104 reference statements)

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“…Furthermore, the formation probability of bound states may be underestimated when we use the elastic current-carrying sting model as in refs. [46][47][48] since the effect of the scalar condensation is not included. To confirm this, it would be very interesting to investigate the dynamical collision of the two-string system and to discuss the possibility of bound state formation of the two bosonic superconducting strings by field-theoretic simulation.…”

Section: Discussionmentioning

confidence: 99%

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Interactions between several types of cosmic strings

Fujikura,

Li,

Yamaguchi

2023

J. High Energ. Phys.

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We study the interaction of several types of static straight cosmic strings, including local strings, global strings, and bosonic superconducting strings with and without magnetic currents. First, we evaluate the interaction energy of two widely separated cosmic strings using the point source formalism and show that the most dominant contribution to the interaction energy comes from the excitation of the lightest mediator particles in a underlying theory. The interaction energy at arbitrary separation distances is then analyzed numerically by the gradient flow method. It turns out that an additional scalar field introduced in the bosonic superconducting string becomes an additional source of attraction. For such a bosonic superconducting string, we find that a string with two winding numbers is energetically favorable compared to two strings with a single winding number in a certain parameter region. Our analysis reveals that a phase structure of bosonic superconducting strings is richer than that of local and global strings and that the formation of bound states at intersections of bosonic superconducting strings is favored.

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Section: Discussionmentioning

confidence: 99%

“…Numerical simulations based on field theory for a perpendicular intersection of two current-carrying bosonic superconducting strings have been done in ref [45],. and the intersection described by the conservative elastic string model, characteristic of current-carrying strings, has been studied in refs [46][47][48]…”

mentioning

confidence: 99%

Interactions between several types of cosmic strings

Fujikura,

Li,

Yamaguchi

2023

J. High Energ. Phys.

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“…where we have decomposed X µ and φ into left-and right-moving modes labelled, respectively, by the subscripts '+' and '−', X 0 ± = σ ± , σ ± = π T (τ ± σ) and T is the period of oscillation that roughly corresponds to the length of the loop (see refs. [63,64] for details of this parameterization). The norm of the vector X ± and the value of the current are related by…”

Section: Jcap11(2022)024mentioning

confidence: 99%

“…(3.9) is verified. Although the shape of the cusp is similar to that of cusps of standard string if current is symmetrical, the velocity of the cusp is necessarily subliminal and given by X 2 ,0 = 1 − F 2 ± [64]. To characterize the gravitational wave bursts emitted by cusps of superconducting strings, we shall use the formalism introduced in refs.…”

Section: Cusp-like Pointmentioning

confidence: 99%

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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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Cosmic strings and gravitational waves

Sousa

2024

Gen Relativ Gravit

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Cosmic string networks are expected to generate a characteristic stochastic gravitational wave background that may be within the reach of current and upcoming gravitational wave detectors. A detection of this spectrum would provide invaluable information about the physics of the early universe, as it would allow us to probe the sequence of phase transitions that happened in the distant past. Here, I review the emission of gravitational waves by Nambu–Goto cosmic strings—thin cosmic strings that couple strongly to gravity only—and by superconducting strings—strings that carry electromagnetic currents. A comparison between the stochastic gravitational wave background predicted in these two very distinct string-forming scenarios reveals that this spectrum may have signatures that may allows us to discriminate between them observationally. The stochastic gravitational wave background generated by cosmic string networks may then enable us to uncover not only the energy-scale of the string-forming phase transition, but the underlying particle physics scenario as well.

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Revisiting Y junctions for strings with currents: Transonic elastic case

Cited by 4 publications

References 55 publications

Interactions between several types of cosmic strings

Interactions between several types of cosmic strings

Emission of gravitational waves by superconducting cosmic strings

Cosmic strings and gravitational waves

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