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Momentum transfer models of interacting dark energy

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arxiv 2107.03235 v2 pith:EEOFTGCH submitted 2021-07-07 astro-ph.CO

classification astro-ph.CO
keywords modelsdarkdataenergyinteractinglambdamomentumquintessence
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abstract

We consider two models of interacting dark energy, both of which interact only through momentum exchange. One is a phenomenological one-parameter extension to $w$CDM, and the other is a coupled quintessence model described by a Lagrangian formalism. Using a variety of high and low redshift data sets, we perform a global fitting of cosmological parameters and compare to $\Lambda$CDM, uncoupled quintessence, and $w$CDM. We find that the models are competitive with $\Lambda$CDM, even obtaining a better fit when certain data sets are included.

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Cited by 5 Pith papers

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

  1. Disentangling Similarity and Relatedness in Topic Models

    cs.CL 2026-03 unverdicted novelty 7.0 of 10

    Topic models lie on a spectrum from thematic-relatedness-rich to similarity-rich, and that position predicts which downstream tasks they handle well.

  2. Phantom-divide crossing and suppressed structure growth in kinetically braided dark energy with momentum exchange

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    A linearly stable kinetic-braiding dark-energy model with CDM momentum exchange realizes upward phantom-divide crossing and weak CDM gravitational clustering, altering matter and CMB spectra.

  3. Revisiting observational constraints on coupled exponential quintessence with energy and momentum transfers: degeneracy with massive neutrinos

    astro-ph.CO 2026-03 conditional novelty 6.0 of 10

    Allowing the neutrino mass to vary removes the 2σ evidence for momentum transfer between dark energy and dark matter in coupled quintessence, via a degeneracy with the energy-exchange coupling.

  4. Dark sector interactions in the $w \rightarrow -1$ limit: velocity locking in pure momentum exchange models

    astro-ph.CO 2025-12 conditional novelty 6.0 of 10

    In momentum-exchange dark sector models, the suppression of matter clustering moves to smaller scales as w→−1 due to velocity locking, and ignoring DE perturbations erases this effect.

  5. Dark matter-baryons elastic coupling

    astro-ph.CO 2026-07 conditional novelty 5.0 of 10

    A new dark-matter–baryon momentum-transfer interaction suppresses small-scale clustering and is mildly preferred by data when a low-redshift S8 measurement is included.

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