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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2505.08761 |
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| _version_ | 1866910194876809216 |
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| author | Ferreira, Pedro da Silveira Owusu, Stephen |
| author_facet | Ferreira, Pedro da Silveira Owusu, Stephen |
| contents | We forecast the detectability of the lensing footprint of a collapsing cosmic texture, a topological defect proposed as an explanation of the CMB Cold Spot. Our pipeline is a quadratic, template-amplitude estimator for localized, azimuthally symmetric lensing profiles: it projects the standard off-diagonal covariance response of lensed CMB fields onto a physically motivated template. Rather than reconstructing an arbitrary lensing field, the method targets weak but coherent localized footprints from sources such as voids, clusters and topological defects. Using the temperature/polarization pairs TT, TE+ET, EE, TB+BT and EB+BE for forthcoming Simons Observatory data, we estimate a $2.3σ$ detection if the texture amplitude reaches the current Planck 2018 $2σ$ upper limit, and a $1.5σ$ measurement for the best-fit texture parameters. This sensitivity is notable given the expected typical deflection angle below $6''$. The inclusion of polarization substantially increases the cumulative signal-to-noise ratio, by $\sim67\%$ relative to temperature alone, making sub-$10''$ localized lensing footprints accessible to SO-like surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_08761 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The CMB Cold Spot under the lens II: Lensing signatures in polarization and cosmic texture footprints Ferreira, Pedro da Silveira Owusu, Stephen Cosmology and Nongalactic Astrophysics We forecast the detectability of the lensing footprint of a collapsing cosmic texture, a topological defect proposed as an explanation of the CMB Cold Spot. Our pipeline is a quadratic, template-amplitude estimator for localized, azimuthally symmetric lensing profiles: it projects the standard off-diagonal covariance response of lensed CMB fields onto a physically motivated template. Rather than reconstructing an arbitrary lensing field, the method targets weak but coherent localized footprints from sources such as voids, clusters and topological defects. Using the temperature/polarization pairs TT, TE+ET, EE, TB+BT and EB+BE for forthcoming Simons Observatory data, we estimate a $2.3σ$ detection if the texture amplitude reaches the current Planck 2018 $2σ$ upper limit, and a $1.5σ$ measurement for the best-fit texture parameters. This sensitivity is notable given the expected typical deflection angle below $6''$. The inclusion of polarization substantially increases the cumulative signal-to-noise ratio, by $\sim67\%$ relative to temperature alone, making sub-$10''$ localized lensing footprints accessible to SO-like surveys. |
| title | The CMB Cold Spot under the lens II: Lensing signatures in polarization and cosmic texture footprints |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2505.08761 |