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arxiv: 0802.0546 · v2 · submitted 2008-02-05 · 🌌 astro-ph · gr-qc

Dark Interactions and Cosmological Fine-Tuning

classification 🌌 astro-ph gr-qc
keywords beendarkcosmologicalenergymodelsproblemcouplingdifferent
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Cosmological models involving an interaction between dark matter and dark energy have been proposed in order to solve the so-called coincidence problem. Different forms of coupling have been studied, but there have been claims that observational data seem to narrow (some of) them down to something annoyingly close to the $\Lambda$CDM model, thus greatly reducing their ability to deal with the problem in the first place. The smallness problem of the initial energy density of dark energy has also been a target of cosmological models in recent years. Making use of a moderately general coupling scheme, this paper aims to unite these different approaches and shed some light as to whether this class of models has any true perspective in suppressing the aforementioned issues that plague our current understanding of the universe, in a quantitative and unambiguous way.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Generalizing the CPL Parametrization through Dark Sector Interaction

    astro-ph.CO 2026-04 unverdicted novelty 5.0

    Dynamical couplings in interacting dark energy models reduce deviations from LambdaCDM to 1.3-1.5 sigma and yield no Bayesian preference over the standard model.

  2. Generalizing the CPL Parametrization through Dark Sector Interaction

    astro-ph.CO 2026-04 unverdicted novelty 5.0

    Generalized interacting dark energy models with constant or dynamical couplings yield analytical density expressions but are not preferred over LambdaCDM by Bayesian evidence from DESI, Pantheon+, and CMB data.