{"work":{"id":"88830598-f367-4129-9822-6628e8b1e071","openalex_id":null,"doi":null,"arxiv_id":"1810.11000","raw_key":null,"title":"Gravitational Waves Induced by non-Gaussian Scalar Perturbations","authors":null,"authors_text":"R","year":2018,"venue":"astro-ph.CO","abstract":"We study gravitational waves (GWs) induced by non-Gaussian curvature perturbations. We calculate the density parameter per logarithmic frequency interval, $\\Omega_\\text{GW}(k)$, given that the power spectrum of the curvature perturbation $\\mathcal{P}_\\mathcal{R}(k)$ has a narrow peak at some small scale $k_*$, with a local-type non-Gaussianity, and constrain the nonlinear parameter $f_\\text{NL}$ with the future LISA sensitivity curve as well as with constraints from the abundance of the primordial black holes (PBHs). We find that the non-Gaussian contribution to $\\Omega_\\text{GW}$ increases as $k^3$, peaks at $k/k_*=4/\\sqrt{3}$, and has a sharp cutoff at $k=4k_*$. The non-Gaussian part can exceed the Gaussian part if $\\mathcal{P}_\\mathcal{R}(k)f_\\text{NL}^2\\gtrsim1$. If both a slope $\\Omega_\\text{GW}(k)\\propto k^\\beta$ with $\\beta\\sim3$ and the multiple-peak structure around a cutoff are observed, it can be recognized as a smoking gun of the primordial non-Gaussianity. We also find that if PBHs with masses of $10^{20}\\text{g}$ to $10^{22}\\text{g}$ are identified as cold dark matter of the Universe, the corresponding GWs must be detectable by LISA-like detectors, irrespective of the value of $\\mathcal{P}_\\mathcal{R}$ or $f_\\text{NL}$.","external_url":"https://arxiv.org/abs/1810.11000","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-01T18:15:57.841091+00:00","pith_arxiv_id":"1810.11000","created_at":"2026-05-10T01:04:50.383612+00:00","updated_at":"2026-07-01T18:15:57.841091+00:00","title_quality_ok":true,"display_title":"Gravitational Waves Induced by non-Gaussian Scalar Perturbations","render_title":"Gravitational Waves Induced by non-Gaussian Scalar Perturbations"},"hub":{"state":{"work_id":"88830598-f367-4129-9822-6628e8b1e071","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":18,"external_cited_by_count":null,"distinct_field_count":3,"first_pith_cited_at":"2020-06-03T17:57:28+00:00","last_pith_cited_at":"2026-06-30T09:54:36+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-07-04T05:06:35.852844+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":10},{"context_role":"other","n":1}],"polarity_counts":[{"context_polarity":"background","n":9},{"context_polarity":"unclear","n":2}],"runs":{},"summary":{},"graph":{},"authors":[]}}