Saved in:
| Main Author: | |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.02122 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915335036207104 |
|---|---|
| author | Linder, Eric V. |
| author_facet | Linder, Eric V. |
| contents | Current data in the form of baryon acoustic oscillation, supernova, and cosmic microwave background distances prefer a cosmology that accelerates more strongly than $Λ$CDM at $z\approx0.5-1.5$, and more weakly at $z\lesssim0.5$. We examine dark energy physics that can accommodate this, showing that interactions (decays, coupling to matter, nonminimal coupling to gravity) fairly generically tend not to give a satisfactory solution (in terms of fitting both distances and growth) even if they enable the effective dark energy equation of state to cross $w=-1$. To fit the cosmological data it appears the dark energy by itself must cross $w=-1$, a highly unusual physical behavior. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_02122 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Uplifting, Depressing, and Tilting Dark Energy Linder, Eric V. Cosmology and Nongalactic Astrophysics Current data in the form of baryon acoustic oscillation, supernova, and cosmic microwave background distances prefer a cosmology that accelerates more strongly than $Λ$CDM at $z\approx0.5-1.5$, and more weakly at $z\lesssim0.5$. We examine dark energy physics that can accommodate this, showing that interactions (decays, coupling to matter, nonminimal coupling to gravity) fairly generically tend not to give a satisfactory solution (in terms of fitting both distances and growth) even if they enable the effective dark energy equation of state to cross $w=-1$. To fit the cosmological data it appears the dark energy by itself must cross $w=-1$, a highly unusual physical behavior. |
| title | Uplifting, Depressing, and Tilting Dark Energy |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2506.02122 |