A low-redshift preference for an interacting dark energy model
Bibliographic record
Abstract
Abstract We explore an interacting dark sector model in trace-free Einstein gravity where dark energy has a constant equation of state, w = -1, and the energy-momentum transfer potential is proportional to the cold dark matter density. Compared to the standard ΛCDM model, this scenario introduces a single additional dimensionless parameter, ϵ , which determines the amplitude of the transfer potential. Using a combination of Planck 2018 Cosmic Microwave Background (CMB), DESI 2024 Baryon Acoustic Oscillation (BAO), and Pantheon+ Type Ia supernovae (SNIa) data, we derive stringent constraints on the interaction, finding ϵ to be of the order of ∼𝒪(10 -4 ). While CMB and SNIa data alone do not favor the presence of such an interaction, the inclusion of DESI data introduces a mild 1 σ preference for an energy-momentum transfer from dark matter to dark energy. This preference is primarily driven by DESI BAO measurements below redshift 1.4, which favor a slightly lower total matter density Ω m compared to CMB constraints. Although the interaction remains weak and does not significantly alleviate the H 0 and S 8 tensions, our results highlight the potential role of dark sector interactions in late-time cosmology.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".