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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2511.00789 |
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| _version_ | 1866918181942067200 |
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| author | Kumar, Darshan Jain, Deepak Mahajan, Shobhit |
| author_facet | Kumar, Darshan Jain, Deepak Mahajan, Shobhit |
| contents | The distance ratio derived from strong gravitational lensing systems, combined with complementary cosmological observations, offers a model-independent means to investigate the geometry and dynamics of the universe. In this study, we carry out a cosmographic investigation using the latest compilations of Type Ia supernovae (PantheonPlus, DESY5, and Union3), baryon acoustic oscillation measurements from DESI-DR2, and updated strong lensing distance ratios. The cosmographic series is expanded to fourth order in the variable $y = z/(1+z)$ to constrain the deceleration, jerk, and snap parameters $(q_0,~j_0,~s_0)$. The analysis utilizes the distance sum rule (DSR) to provide an independent assessment of the spatial curvature parameter, $Ω_{k0}$, without assuming a specific dynamical model. Our results based on SGL distance ratio measurements combined with individual supernova datasets suggest a mild preference for an open universe, though a flat universe is supported at the 95% confidence level. Further, the inclusion of DESI-DR2 data in each combination provides tighter constraints on the parameters and confirms flatness within the 68% confidence level as expected in standard cosmology. The results for $q_0$ and $j_0$ are consistent with $Λ$CDM predictions across datasets, while the constraint on $s_0$ remains limited but improves with the inclusion of DESI-DR2. This is the second and final paper in a two-part series. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_00789 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A cosmographic analysis using DESI-DR2 and strong lensing: II. Distance Ratio measurements Kumar, Darshan Jain, Deepak Mahajan, Shobhit Cosmology and Nongalactic Astrophysics The distance ratio derived from strong gravitational lensing systems, combined with complementary cosmological observations, offers a model-independent means to investigate the geometry and dynamics of the universe. In this study, we carry out a cosmographic investigation using the latest compilations of Type Ia supernovae (PantheonPlus, DESY5, and Union3), baryon acoustic oscillation measurements from DESI-DR2, and updated strong lensing distance ratios. The cosmographic series is expanded to fourth order in the variable $y = z/(1+z)$ to constrain the deceleration, jerk, and snap parameters $(q_0,~j_0,~s_0)$. The analysis utilizes the distance sum rule (DSR) to provide an independent assessment of the spatial curvature parameter, $Ω_{k0}$, without assuming a specific dynamical model. Our results based on SGL distance ratio measurements combined with individual supernova datasets suggest a mild preference for an open universe, though a flat universe is supported at the 95% confidence level. Further, the inclusion of DESI-DR2 data in each combination provides tighter constraints on the parameters and confirms flatness within the 68% confidence level as expected in standard cosmology. The results for $q_0$ and $j_0$ are consistent with $Λ$CDM predictions across datasets, while the constraint on $s_0$ remains limited but improves with the inclusion of DESI-DR2. This is the second and final paper in a two-part series. |
| title | A cosmographic analysis using DESI-DR2 and strong lensing: II. Distance Ratio measurements |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2511.00789 |