New constraints on primordial non-Gaussianity from large-scale cross-correlations of CMB lensing and the cosmic infrared background
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| author | Thornton, Joseph McCarthy, Fiona Villagra, Carmen Embil Sherwin, Blake D. |
| author_facet | Thornton, Joseph McCarthy, Fiona Villagra, Carmen Embil Sherwin, Blake D. |
| contents | We present new constraints on the local-type primordial non-Gaussianity parameter, $f_\mathrm{NL}^\mathrm{local}$, through analysis of the scale-dependent bias effect on the cosmic infrared background (CIB). To avoid biases from galactic dust contamination on large scales, we use cross-correlations between the CIB and Planck cosmic microwave background (CMB) lensing maps to constrain non-Gaussianity. Our measurement employs new dust-cleaned CIB maps that have been designed to be unbiased on large scales, which allows us to improve our constraining power on $f_\mathrm{NL}^\mathrm{local}$ by a factor of $\sim 2$ over previous CIB analyses. We derive a constraint of $f_\mathrm{NL}^\mathrm{local}=43 \pm 23$, matching the precision of the tightest existing constraints from cross-correlation methods. Consistency- and null-tests demonstrate that our results are robust to modeling assumptions and residual dust contamination. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_03783 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | New constraints on primordial non-Gaussianity from large-scale cross-correlations of CMB lensing and the cosmic infrared background Thornton, Joseph McCarthy, Fiona Villagra, Carmen Embil Sherwin, Blake D. Cosmology and Nongalactic Astrophysics We present new constraints on the local-type primordial non-Gaussianity parameter, $f_\mathrm{NL}^\mathrm{local}$, through analysis of the scale-dependent bias effect on the cosmic infrared background (CIB). To avoid biases from galactic dust contamination on large scales, we use cross-correlations between the CIB and Planck cosmic microwave background (CMB) lensing maps to constrain non-Gaussianity. Our measurement employs new dust-cleaned CIB maps that have been designed to be unbiased on large scales, which allows us to improve our constraining power on $f_\mathrm{NL}^\mathrm{local}$ by a factor of $\sim 2$ over previous CIB analyses. We derive a constraint of $f_\mathrm{NL}^\mathrm{local}=43 \pm 23$, matching the precision of the tightest existing constraints from cross-correlation methods. Consistency- and null-tests demonstrate that our results are robust to modeling assumptions and residual dust contamination. |
| title | New constraints on primordial non-Gaussianity from large-scale cross-correlations of CMB lensing and the cosmic infrared background |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2605.03783 |