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Observational Constraints on Axion(s) Dark Energy with a Cosmological Constant

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arxiv 2005.08813 v2 pith:YFXC72IQ submitted 2020-05-18 astro-ph.CO hep-phhep-th

Ruchika , Shahnawaz A. Adil , Koushik Dutta , Ankan Mukherjee , Anjan A. Sen This is my paper
classification astro-ph.COhep-phhep-th
keywords axionmodelconstantdarkenergyfieldcosmologicalobservational
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abstract

The present work deals with a dark energy model that has an oscillating scalar field potential along with a cosmological constant (CC). The oscillating part of the potential represents the contribution of a light axion field in the dark energy that has its origin in the String-Axiverse scenario. The model has been confronted with the latest cosmological observations. The results show that a sub-Planckian value of the axion field decay constant is consistent with observational data. Furthermore, in terms of the observational data considered in this work, the axion model is preferred over the $\Lambda$CDM model in terms of AIC, BIC information criteria as well as in terms of Bayesian evidence. The oscillating feature in the scalar field evolution and in the equation of state for the dark energy can be observed for the allowed parameters space. It is also observed that cluster number counts in this axion model are suppressed compared to the $\Lambda$CDM and this suppression is enhanced for the sub-Planckian values for the axion decay constant.

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Cited by 3 Pith papers

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

  1. Alleviating the Hubble Tension with Smooth Sign-Switching Dark Energy: Full CMB Constraints with DESI and PantheonPlus

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

    Smooth ECDM dark energy remains compatible with Planck+ACT+SPT, DESI DR2 and Pantheon+/SH0ES while alleviating the Hubble tension through a controlled late-time density transition.

  2. Background-level reconstruction of scalar-field potentials from dark-energy histories and comparison with analytic potential families

    astro-ph.CO 2026-03 conditional novelty 5.5 of 10

    A background reconstruction maps prescribed ρ_de(z) histories to V(φ) and ranks analytic potentials by Bayesian evidence, with exponential preferred for CPL and shifted-tanh for sign-switching targets.

  3. The Lifespan of our Universe

    hep-ph 2025-06 conditional novelty 4.0 of 10

    If the axion dark energy model with a negative cosmological constant is the true explanation of DES/DESI data, the universe will end in a big crunch at a total age of about 33 billion years.

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