The Atacama Cosmology Telescope: Constraints on Local Non-Gaussianity from the ACT Cluster Catalog
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arXiv
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| Format: | Preprint |
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2026
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| author | Sarieddine, Leonid Bond, J. Richard Hilton, Matt Jimenez, Raul Kosowsky, Arthur Moodley, Kavilan Guachalla, Bernardita Ried Sifón, Cristóbal Staggs, Suzanne T. Verde, Licia Wollack, Edward J. |
| author_facet | Sarieddine, Leonid Bond, J. Richard Hilton, Matt Jimenez, Raul Kosowsky, Arthur Moodley, Kavilan Guachalla, Bernardita Ried Sifón, Cristóbal Staggs, Suzanne T. Verde, Licia Wollack, Edward J. |
| contents | We derive constraints on local-type primordial non-Gaussianity using the ACT DR6 Sunyaev--Zel'dovich cluster catalog. Modeling the redshift- and mass-dependent number counts of 1,201 clusters in the 10,347~deg$^2$ Legacy region, and accounting for survey completeness, intrinsic SZ scatter, and a weak-lensing-calibrated mass bias, we compute theoretical abundances using the Log--Edgeworth halo mass function. Assuming $Λ$CDM with well-motivated external priors, we obtain $f_{\rm NL} = 55 \pm 125$ (68% CL), consistent with Gaussian initial conditions. These constraints probe comoving scales of $5$--$10~{\rm Mpc}~h^{-1}$, complementing CMB bispectrum and scale-dependent bias measurements, which do not reach such small scales. We also find evidence for a 16.4% residual mass bias, which, although heavily informed by our adopted priors, plays a key role in matching observed and predicted counts but has negligible effect on $f_{\rm NL}$ constraints. We briefly discuss robustness of the results under relaxed priors and the prospects for next-generation SZ and lensing surveys to strengthen cluster-based tests of primordial non-Gaussianity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_03917 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Atacama Cosmology Telescope: Constraints on Local Non-Gaussianity from the ACT Cluster Catalog Sarieddine, Leonid Bond, J. Richard Hilton, Matt Jimenez, Raul Kosowsky, Arthur Moodley, Kavilan Guachalla, Bernardita Ried Sifón, Cristóbal Staggs, Suzanne T. Verde, Licia Wollack, Edward J. Cosmology and Nongalactic Astrophysics We derive constraints on local-type primordial non-Gaussianity using the ACT DR6 Sunyaev--Zel'dovich cluster catalog. Modeling the redshift- and mass-dependent number counts of 1,201 clusters in the 10,347~deg$^2$ Legacy region, and accounting for survey completeness, intrinsic SZ scatter, and a weak-lensing-calibrated mass bias, we compute theoretical abundances using the Log--Edgeworth halo mass function. Assuming $Λ$CDM with well-motivated external priors, we obtain $f_{\rm NL} = 55 \pm 125$ (68% CL), consistent with Gaussian initial conditions. These constraints probe comoving scales of $5$--$10~{\rm Mpc}~h^{-1}$, complementing CMB bispectrum and scale-dependent bias measurements, which do not reach such small scales. We also find evidence for a 16.4% residual mass bias, which, although heavily informed by our adopted priors, plays a key role in matching observed and predicted counts but has negligible effect on $f_{\rm NL}$ constraints. We briefly discuss robustness of the results under relaxed priors and the prospects for next-generation SZ and lensing surveys to strengthen cluster-based tests of primordial non-Gaussianity. |
| title | The Atacama Cosmology Telescope: Constraints on Local Non-Gaussianity from the ACT Cluster Catalog |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2602.03917 |