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New Massless Spectra from Cosmic String Cusps
High Energy Physics - Phenomenology · Submitted 13 Dec 2025 · Published version
abstract compiled · 2026-10-16 · no language-model review
The authors' main claim We identify novel cusp solutions with different, including smooth, shapes, and compute their massless GW and axion spectra.
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The abstract, sentence by sentence
In the standard picture of cosmic strings, cusps are generic features of Nambu-Goto loops where the string momentarily reaches the speed of light. They have a characteristic sharp profile, following $y \sim x^{2/3}$ in the $(x,y)$ plane, and produce strong gravitational-wave (GW) bursts with waveform $\tilde\kappa(\omega) \propto \omega^{-4/3}$, making them key targets for GW searches. However, under certain conditions, this generic picture can differ. We identify novel cusp solutions with different, including smooth, shapes, and compute their massless GW and axion spectra. We derive a general expression for all possible Nambu-Goto cusp spectra with the asymptotic form $\tilde\kappa(\omega) \propto \omega^{-n/(2n-1)} \omega^{-m/(2m-1)}$ where $n, m\geq 2$. We calculate the effect on the waveform of realistic corrections to the Nambu-Goto description, such as those from backreaction and finite string width, which introduce a high frequency cutoff.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In the standard picture of cosmic strings, cusps are generic features of Nambu-Goto loops where the string momentarily reaches the speed of light. | background 1.00 | 0.04 | 0.03 | asserted 1.00 |
| s1 | They have a characteristic sharp profile, following $y \sim x^{2/3}$ in the $(x,y)$ plane, and produce strong gravitational-wave (GW) bursts with waveform $\tilde\kappa(\omega) \propto \omega^{-4/3}$, making them key targets for GW searches. | background 1.00 | 0.07 | 0.04 | asserted 1.00 |
| s2 | However, under certain conditions, this generic picture can differ. | gap 0.81 | 0.06 | 0.04 | hedged possibility 0.78 |
| s3 | We identify novel cusp solutions with different, including smooth, shapes, and compute their massless GW and axion spectra. | contribution 0.99 | 0.97 | 0.59 | asserted 1.00 |
| s4 | We derive a general expression for all possible Nambu-Goto cusp spectra with the asymptotic form $\tilde\kappa(\omega) \propto \omega^{-n/(2n-1)} \omega^{-m/(2m-1)}$ where $n, m\geq 2$. | result 0.81 | 0.96 | 0.43 | asserted 1.00 |
| s5 | We calculate the effect on the waveform of realistic corrections to the Nambu-Goto description, such as those from backreaction and finite string width, which introduce a high frequency cutoff. | contribution 0.67 | 0.93 | 0.08 | asserted 1.00 |
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Original abstract
In the standard picture of cosmic strings, cusps are generic features of Nambu-Goto loops where the string momentarily reaches the speed of light. They have a characteristic sharp profile, following $y \sim x^{2/3}$ in the $(x,y)$ plane, and produce strong gravitational-wave (GW) bursts with waveform $\tilde\kappa(\omega) \propto \omega^{-4/3}$, making them key targets for GW searches. However, under certain conditions, this generic picture can differ. We identify novel cusp solutions with different, including smooth, shapes, and compute their massless GW and axion spectra. We derive a general expression for all possible Nambu-Goto cusp spectra with the asymptotic form $\tilde\kappa(\omega) \propto \omega^{-n/(2n-1)} \omega^{-m/(2m-1)}$ where $n, m\geq 2$. We calculate the effect on the waveform of realistic corrections to the Nambu-Goto description, such as those from backreaction and finite string width, which introduce a high frequency cutoff.
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