Tracing Primordial Gravitational Waves via non-Gaussian Signatures of Halo Bias
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2026
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866910189688455168 |
|---|---|
| author | Abdelaziz, Mariam Bari, Pritha Matarrese, Sabino Ricciardone, Angelo |
| author_facet | Abdelaziz, Mariam Bari, Pritha Matarrese, Sabino Ricciardone, Angelo |
| contents | Primordial gravitational waves (PGWs) generate scalar density perturbations at second order. Since the induced density contrast is quadratic in the tensor field, it is intrinsically non-Gaussian. We study the imprint of this tensor-induced non-Gaussianity (NG) on the large-scale clustering of dark matter halos through its correction to halo bias. Focusing on inflationary scenarios with a peaked primordial tensor spectrum, we derive the leading scale-dependent contribution sourced by the bispectrum of the induced density field. While yielding a percent-level bias correction for massive low-redshift halos, this effect can reach an $\mathcal{O}(1)$ modulation for rare, high-redshift halos at $z=7$. Notably, the resulting signature exhibits a distinct scale dependence that is not captured by standard primordial non-Gaussianity (PNG) templates. Our results establish halo bias as a novel probe of PGWs through their imprint on the large-scale structure, providing a complementary window into the inflationary epoch. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_02882 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Tracing Primordial Gravitational Waves via non-Gaussian Signatures of Halo Bias Abdelaziz, Mariam Bari, Pritha Matarrese, Sabino Ricciardone, Angelo Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology Primordial gravitational waves (PGWs) generate scalar density perturbations at second order. Since the induced density contrast is quadratic in the tensor field, it is intrinsically non-Gaussian. We study the imprint of this tensor-induced non-Gaussianity (NG) on the large-scale clustering of dark matter halos through its correction to halo bias. Focusing on inflationary scenarios with a peaked primordial tensor spectrum, we derive the leading scale-dependent contribution sourced by the bispectrum of the induced density field. While yielding a percent-level bias correction for massive low-redshift halos, this effect can reach an $\mathcal{O}(1)$ modulation for rare, high-redshift halos at $z=7$. Notably, the resulting signature exhibits a distinct scale dependence that is not captured by standard primordial non-Gaussianity (PNG) templates. Our results establish halo bias as a novel probe of PGWs through their imprint on the large-scale structure, providing a complementary window into the inflationary epoch. |
| title | Tracing Primordial Gravitational Waves via non-Gaussian Signatures of Halo Bias |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2605.02882 |