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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2508.05395 |
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| _version_ | 1866909727983665152 |
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| author | Dimitriou, Androniki Figueroa, Daniel G. Simakachorn, Peera Zaldivar, Bryan |
| author_facet | Dimitriou, Androniki Figueroa, Daniel G. Simakachorn, Peera Zaldivar, Bryan |
| contents | We present a catalog of gravitational wave background (GWB) signal templates from cosmic-string networks, based on relevant models proposed in the literature. We classify templates as conventional, based on standard cosmology and Nambu-Goto results (VOS and BOS), and beyond conventional, based on modifications of a) the loop number density (LRS, super, metastable, current-carrying strings), b) the expansion history (non-standard cosmologies, extra degrees of freedom, either thermal or secluded), or c) the loop properties (birth length, power emission). Using the SBI package $\texttt{GWBackFinder}$, we quantify the reconstruction precision of each signal by LISA, scanning over their parameter space, and performing model comparisons. For conventional signals, LISA reconstructs the tension $Gμ$ with an error $\lesssim 10\%$ for $Gμ\gtrsim 5\cdot 10^{-15}$, which decreases down to $2-3\%$ for $Gμ\gtrsim 10^{-12}$. BOS and VOS modelings become distinguishable confidently for $Gμ\gtrsim 5\cdot 10^{-13}$. For beyond-conventional signals, we identify SNR and error-threshold intervals for each parameter, and determine (for few examples) the regions where they can be distinguished from conventional signals. Analogous quality reconstruction studies of cosmic-string GWBs, superimposed over leading astrophysical foregrounds in the LISA window, will be presented in a series of upcoming papers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_05395 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmic string gravitational wave backgrounds at LISA: I. Signal survey, template reconstruction, and model comparison Dimitriou, Androniki Figueroa, Daniel G. Simakachorn, Peera Zaldivar, Bryan Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology We present a catalog of gravitational wave background (GWB) signal templates from cosmic-string networks, based on relevant models proposed in the literature. We classify templates as conventional, based on standard cosmology and Nambu-Goto results (VOS and BOS), and beyond conventional, based on modifications of a) the loop number density (LRS, super, metastable, current-carrying strings), b) the expansion history (non-standard cosmologies, extra degrees of freedom, either thermal or secluded), or c) the loop properties (birth length, power emission). Using the SBI package $\texttt{GWBackFinder}$, we quantify the reconstruction precision of each signal by LISA, scanning over their parameter space, and performing model comparisons. For conventional signals, LISA reconstructs the tension $Gμ$ with an error $\lesssim 10\%$ for $Gμ\gtrsim 5\cdot 10^{-15}$, which decreases down to $2-3\%$ for $Gμ\gtrsim 10^{-12}$. BOS and VOS modelings become distinguishable confidently for $Gμ\gtrsim 5\cdot 10^{-13}$. For beyond-conventional signals, we identify SNR and error-threshold intervals for each parameter, and determine (for few examples) the regions where they can be distinguished from conventional signals. Analogous quality reconstruction studies of cosmic-string GWBs, superimposed over leading astrophysical foregrounds in the LISA window, will be presented in a series of upcoming papers. |
| title | Cosmic string gravitational wave backgrounds at LISA: I. Signal survey, template reconstruction, and model comparison |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2508.05395 |