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Cosmological signatures of ultralight dark matter with an axionlike potential

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arxiv 1703.10180 v3 pith:UX6ADUZ7 submitted 2017-03-29 gr-qc astro-ph.CO

Francisco X. Linares Cedeño , Alma X. González-Morales , L. Arturo Ureña-López This is my paper · ORCID
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keywords axionpotentialfieldaxionlikecosmologicalinstabilitylinearnonlinearities
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abstract

Nonlinearities in a realistic axion field potential may play an important role in the cosmological dynamics. In this paper we use the Boltzmann code CLASS to solve the background and linear perturbations evolution of an axion field and contrast our results with those of CDM and the free axion case. We conclude that there is a slight delay in the onset of the axion field oscillations when nonlinearities in the axion potential are taken into account. Besides, we identify a tachyonic instability of linear modes resulting in the presence of a bump in the power spectrum at small scales. Some comments are in turn about the true source of the tachyonic instability, how the parameters of the axionlike potential can be constrained by Ly-$\alpha$ observations, and the consequences in the stability of self-gravitating objects made of axions.

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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. Fuzzy Axions and Associated Relics

    hep-th 2024-12 conditional novelty 8.0 of 10

    In explicit string theory compactifications, fuzzy axion dark matter is rare and typically requires fine-tuning of initial axion displacements or a non-standard reheating epoch to avoid overproducing heavier axions.

  2. Accurate method for ultralight axion CMB and matter power spectra

    astro-ph.CO 2024-12 conditional novelty 7.0 of 10

    AxiECAMB computes CMB and matter power spectra for ultralight axions across 10^-33 to 10^-18 eV by time-averaging fast field oscillations, with metric and fluid matching that reduces errors far below cosmic variance f...

  3. Extended Dark Energy analysis using DESI DR2 BAO measurements

    astro-ph.CO 2025-03 conditional novelty 4.0 of 10

    Extended analysis of DESI DR2 data confirms robust evidence for dynamical dark energy with phantom crossing preference, stable under parametric and non-parametric modeling.

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