Halving and Doubling: Boosting the Detection of Relativistic Effects in the Galaxy Bispectrum with Optimal Subsample Selection
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866912931905536000 |
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| author | Rossiter, Samantha Josephine Camera, Stefano Montano, Federico Clarkson, Chris Karagiannis, Dionysios Maartens, Roy |
| author_facet | Rossiter, Samantha Josephine Camera, Stefano Montano, Federico Clarkson, Chris Karagiannis, Dionysios Maartens, Roy |
| contents | On the scale of the cosmic horizon, signatures that are unique to general relativity are concealed within the statistics of the large scale distribution of galaxies. These were thought to be beyond the reach of all but the most ambitious galaxy surveys, as they are substantially suppressed relative to standard redshift-space distortions. We show that the detectability of these higher-order relativistic effects can be dramatically enhanced by a sampling strategy that splits a galaxy catalogue into faint and bright subsamples and then combines their auto-bispectra. For current surveys such as DESI, this implies that this new signal will be detectable for the first time using our new strategy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_00244 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Halving and Doubling: Boosting the Detection of Relativistic Effects in the Galaxy Bispectrum with Optimal Subsample Selection Rossiter, Samantha Josephine Camera, Stefano Montano, Federico Clarkson, Chris Karagiannis, Dionysios Maartens, Roy Cosmology and Nongalactic Astrophysics On the scale of the cosmic horizon, signatures that are unique to general relativity are concealed within the statistics of the large scale distribution of galaxies. These were thought to be beyond the reach of all but the most ambitious galaxy surveys, as they are substantially suppressed relative to standard redshift-space distortions. We show that the detectability of these higher-order relativistic effects can be dramatically enhanced by a sampling strategy that splits a galaxy catalogue into faint and bright subsamples and then combines their auto-bispectra. For current surveys such as DESI, this implies that this new signal will be detectable for the first time using our new strategy. |
| title | Halving and Doubling: Boosting the Detection of Relativistic Effects in the Galaxy Bispectrum with Optimal Subsample Selection |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2603.00244 |