A foreground-marginalized 'BK-lite' likelihood for the tensor-to-scalar ratio
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866914697612099584 |
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| author | Prince, Heather Calabrese, Erminia Dunkley, Jo |
| author_facet | Prince, Heather Calabrese, Erminia Dunkley, Jo |
| contents | The current limit on the tensor-to-scalar ratio from the BICEP/Keck Collaboration (with r<0.036 at 95% confidence) puts pressure on early universe models, with less than 10% of the error on r attributed to uncertainty in Galactic foregrounds. We use the BICEP/Keck BK18 public multi-frequency likelihood to test some further assumptions made in the foreground modeling, finding little impact on the estimate for r. We then estimate foreground-marginalized cosmic microwave background (CMB) B-mode polarization bandpowers. We fit them with a multivariate offset-lognormal distribution and construct a marginalized 'BK-lite' likelihood for the CMB B-mode spectrum with no nuisance parameters, serving as a method demonstration for future analyses of small sky regions, for example from the South Pole Observatory or CMB-S4. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_00085 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A foreground-marginalized 'BK-lite' likelihood for the tensor-to-scalar ratio Prince, Heather Calabrese, Erminia Dunkley, Jo Cosmology and Nongalactic Astrophysics The current limit on the tensor-to-scalar ratio from the BICEP/Keck Collaboration (with r<0.036 at 95% confidence) puts pressure on early universe models, with less than 10% of the error on r attributed to uncertainty in Galactic foregrounds. We use the BICEP/Keck BK18 public multi-frequency likelihood to test some further assumptions made in the foreground modeling, finding little impact on the estimate for r. We then estimate foreground-marginalized cosmic microwave background (CMB) B-mode polarization bandpowers. We fit them with a multivariate offset-lognormal distribution and construct a marginalized 'BK-lite' likelihood for the CMB B-mode spectrum with no nuisance parameters, serving as a method demonstration for future analyses of small sky regions, for example from the South Pole Observatory or CMB-S4. |
| title | A foreground-marginalized 'BK-lite' likelihood for the tensor-to-scalar ratio |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2403.00085 |