Probing General Relativity on Cosmological Scales in the 2040s
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Montano, Federico Rossiter, Samantha J. Addis, Chris Hammond, Jessie Camera, Stefano Clarkson, Chris Elkhashab, Mohamed Yousry Guidi, Massimo Lahav, Ofer Aricò, Giovanni Contarini, Sofia Dayal, Pratika Degni, Giulia Farina, Antonio Iršič, Vid Marulli, Federico Sarpa, Elena Sartori, Simone Sefusatti, Emiliano Verdiani, Francesco Verza, Giovanni |
| author_facet | Montano, Federico Rossiter, Samantha J. Addis, Chris Hammond, Jessie Camera, Stefano Clarkson, Chris Elkhashab, Mohamed Yousry Guidi, Massimo Lahav, Ofer Aricò, Giovanni Contarini, Sofia Dayal, Pratika Degni, Giulia Farina, Antonio Iršič, Vid Marulli, Federico Sarpa, Elena Sartori, Simone Sefusatti, Emiliano Verdiani, Francesco Verza, Giovanni |
| contents | General relativity is exquisitely tested in strong-field regimes, yet its validity on cosmological scales remains largely unexplored. Upcoming wide and deep large-scale structure surveys will access the ultra-large, linear scales where relativistic effects - Doppler terms, gravitational redshift, lensing magnification, and potential evolution - leave significant imprints in the clustering of galaxies. These signatures represent unique probes of spacetime that are inaccessible to standard Newtonian analyses but increasingly important as survey volumes grow. We outline the scientific potential of next-generation facilities, such as those envisioned within ESO's Expanding Horizons programme, to deliver the first robust measurements of relativistic effects in large-scale structure through multi-tracer power spectra and the single-tracer bispectrum of high-redshift Lyman-break galaxies. Detecting these contributions would open a new window on gravity, enabling precision tests of general relativity and its alternatives on cosmological scales in the 2040s. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_05320 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Probing General Relativity on Cosmological Scales in the 2040s Montano, Federico Rossiter, Samantha J. Addis, Chris Hammond, Jessie Camera, Stefano Clarkson, Chris Elkhashab, Mohamed Yousry Guidi, Massimo Lahav, Ofer Aricò, Giovanni Contarini, Sofia Dayal, Pratika Degni, Giulia Farina, Antonio Iršič, Vid Marulli, Federico Sarpa, Elena Sartori, Simone Sefusatti, Emiliano Verdiani, Francesco Verza, Giovanni Cosmology and Nongalactic Astrophysics General relativity is exquisitely tested in strong-field regimes, yet its validity on cosmological scales remains largely unexplored. Upcoming wide and deep large-scale structure surveys will access the ultra-large, linear scales where relativistic effects - Doppler terms, gravitational redshift, lensing magnification, and potential evolution - leave significant imprints in the clustering of galaxies. These signatures represent unique probes of spacetime that are inaccessible to standard Newtonian analyses but increasingly important as survey volumes grow. We outline the scientific potential of next-generation facilities, such as those envisioned within ESO's Expanding Horizons programme, to deliver the first robust measurements of relativistic effects in large-scale structure through multi-tracer power spectra and the single-tracer bispectrum of high-redshift Lyman-break galaxies. Detecting these contributions would open a new window on gravity, enabling precision tests of general relativity and its alternatives on cosmological scales in the 2040s. |
| title | Probing General Relativity on Cosmological Scales in the 2040s |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2601.05320 |