When One-Parameter Dark Energy Makes Neutrinos Physical Again
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866912968560607232 |
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| author | Yang, Weiqiang Di Valentino, Eleonora Linder, Eric V. Zhang, Sibo Pan, Supriya |
| author_facet | Yang, Weiqiang Di Valentino, Eleonora Linder, Eric V. Zhang, Sibo Pan, Supriya |
| contents | A puzzling implication of current data interpreted in the $Λ$CDM cosmology is the preference for a negative sum of neutrino masses. Moving to $w_0w_a$CDM brings an appreciable fraction of the neutrino mass posterior back to positive values, while the constant equation-of-state dark energy case $w$CDM does not. We investigate a variety of one-parameter dark energy equations of state (DE EoS), each variation with particular physical properties, to understand whether a two-parameter DE EoS is required to bring the neutrino mass positive. The conclusion is that certain one-parameter DE EoS can suffice, implying that the data are pointing toward physical characteristics rather than a broad degeneracy. The required characteristics are identified as phantom dark energy at high redshift, crossing $w=-1$ at lower redshift. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_15422 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | When One-Parameter Dark Energy Makes Neutrinos Physical Again Yang, Weiqiang Di Valentino, Eleonora Linder, Eric V. Zhang, Sibo Pan, Supriya Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology A puzzling implication of current data interpreted in the $Λ$CDM cosmology is the preference for a negative sum of neutrino masses. Moving to $w_0w_a$CDM brings an appreciable fraction of the neutrino mass posterior back to positive values, while the constant equation-of-state dark energy case $w$CDM does not. We investigate a variety of one-parameter dark energy equations of state (DE EoS), each variation with particular physical properties, to understand whether a two-parameter DE EoS is required to bring the neutrino mass positive. The conclusion is that certain one-parameter DE EoS can suffice, implying that the data are pointing toward physical characteristics rather than a broad degeneracy. The required characteristics are identified as phantom dark energy at high redshift, crossing $w=-1$ at lower redshift. |
| title | When One-Parameter Dark Energy Makes Neutrinos Physical Again |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2603.15422 |