Is Dynamical Dark Energy Necessary? DESI BAO and Modified Recombination
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908729219219456 |
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| author | Mirpoorian, Seyed Hamidreza Jedamzik, Karsten Pogosian, Levon |
| author_facet | Mirpoorian, Seyed Hamidreza Jedamzik, Karsten Pogosian, Levon |
| contents | Recent measurements of baryon acoustic oscillations (BAO) by the Dark Energy Spectroscopic Instrument (DESI) exhibit a mild-to-moderate tension with cosmic microwave background (CMB) and Type Ia supernova (SN) observations when interpreted within the $Λ$CDM framework. This discrepancy has been cited as evidence for dynamical dark energy (DDE). Given the profound implications of DDE for fundamental physics, we explore whether the tension can instead be resolved by modifying the physics of recombination. We find that a phenomenological model of modified recombination can effectively reconcile the BAO and CMB datasets and, unlike DDE, also predicts a higher Hubble constant $H_0$, thereby partially alleviating the Hubble tension. A global fit to BAO, CMB, and calibrated SN data favors modified recombination over DDE. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_15274 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Is Dynamical Dark Energy Necessary? DESI BAO and Modified Recombination Mirpoorian, Seyed Hamidreza Jedamzik, Karsten Pogosian, Levon Cosmology and Nongalactic Astrophysics Recent measurements of baryon acoustic oscillations (BAO) by the Dark Energy Spectroscopic Instrument (DESI) exhibit a mild-to-moderate tension with cosmic microwave background (CMB) and Type Ia supernova (SN) observations when interpreted within the $Λ$CDM framework. This discrepancy has been cited as evidence for dynamical dark energy (DDE). Given the profound implications of DDE for fundamental physics, we explore whether the tension can instead be resolved by modifying the physics of recombination. We find that a phenomenological model of modified recombination can effectively reconcile the BAO and CMB datasets and, unlike DDE, also predicts a higher Hubble constant $H_0$, thereby partially alleviating the Hubble tension. A global fit to BAO, CMB, and calibrated SN data favors modified recombination over DDE. |
| title | Is Dynamical Dark Energy Necessary? DESI BAO and Modified Recombination |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.15274 |