Reconstructing Primordial Curvature Perturbations via Scalar-Induced Gravitational Waves with LISA
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2025
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| author | Gammal, Jonas El Ghaleb, Aya Franciolini, Gabriele Papanikolaou, Theodoros Peloso, Marco Perna, Gabriele Pieroni, Mauro Ricciardone, Angelo Rosati, Robert Tasinato, Gianmassimo Braglia, Matteo Fumagalli, Jacopo Kume, Jun'ya Morgante, Enrico Nardini, Germano Racco, Davide Renaux-Petel, Sébastien Veermäe, Hardi Werth, Denis Zavala, Ivonne |
| author_facet | Gammal, Jonas El Ghaleb, Aya Franciolini, Gabriele Papanikolaou, Theodoros Peloso, Marco Perna, Gabriele Pieroni, Mauro Ricciardone, Angelo Rosati, Robert Tasinato, Gianmassimo Braglia, Matteo Fumagalli, Jacopo Kume, Jun'ya Morgante, Enrico Nardini, Germano Racco, Davide Renaux-Petel, Sébastien Veermäe, Hardi Werth, Denis Zavala, Ivonne |
| contents | Many early universe scenarios predict an enhancement of scalar perturbations at scales currently unconstrained by cosmological probes. These perturbations source gravitational waves (GWs) at second order in perturbation theory, leading to a scalar-induced gravitational wave (SIGW) background. The LISA detector, sensitive to mHz GWs, will be able to constrain curvature perturbations in a new window corresponding to scales $k \in [10^{10}, 10^{14}] \,{\rm Mpc}^{-1}$, difficult to probe otherwise. In this work, we forecast the capabilities of LISA to constrain the source of SIGWs using different approaches: i) agnostic, where the spectrum of curvature perturbations is binned in frequency space; ii) template-based, modeling the curvature power spectrum based on motivated classes of models; iii) ab initio, starting from first-principles model of inflation featuring an ultra-slow roll phase. We compare the strengths and weaknesses of each approach. We also discuss the impact on the SIGW spectrum of non-standard thermal histories affecting the kernels of SIGW emission and non-Gaussianity in the statistics of the curvature perturbations. Finally, we propose simple tests to assess whether the signal is compatible with the SIGW hypothesis. The pipeline used is built into the SIGWAY code. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_11320 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Reconstructing Primordial Curvature Perturbations via Scalar-Induced Gravitational Waves with LISA Gammal, Jonas El Ghaleb, Aya Franciolini, Gabriele Papanikolaou, Theodoros Peloso, Marco Perna, Gabriele Pieroni, Mauro Ricciardone, Angelo Rosati, Robert Tasinato, Gianmassimo Braglia, Matteo Fumagalli, Jacopo Kume, Jun'ya Morgante, Enrico Nardini, Germano Racco, Davide Renaux-Petel, Sébastien Veermäe, Hardi Werth, Denis Zavala, Ivonne Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory Many early universe scenarios predict an enhancement of scalar perturbations at scales currently unconstrained by cosmological probes. These perturbations source gravitational waves (GWs) at second order in perturbation theory, leading to a scalar-induced gravitational wave (SIGW) background. The LISA detector, sensitive to mHz GWs, will be able to constrain curvature perturbations in a new window corresponding to scales $k \in [10^{10}, 10^{14}] \,{\rm Mpc}^{-1}$, difficult to probe otherwise. In this work, we forecast the capabilities of LISA to constrain the source of SIGWs using different approaches: i) agnostic, where the spectrum of curvature perturbations is binned in frequency space; ii) template-based, modeling the curvature power spectrum based on motivated classes of models; iii) ab initio, starting from first-principles model of inflation featuring an ultra-slow roll phase. We compare the strengths and weaknesses of each approach. We also discuss the impact on the SIGW spectrum of non-standard thermal histories affecting the kernels of SIGW emission and non-Gaussianity in the statistics of the curvature perturbations. Finally, we propose simple tests to assess whether the signal is compatible with the SIGW hypothesis. The pipeline used is built into the SIGWAY code. |
| title | Reconstructing Primordial Curvature Perturbations via Scalar-Induced Gravitational Waves with LISA |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2501.11320 |