One‐parametric description for scalar field dark matter potentials

Cedeño, Francisco X. Linares; Ureña–López, L. Arturo

doi:10.1002/asna.202113942

Cited by 6 publications

(2 citation statements)

References 63 publications

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“…Refs. [24][25][26][27][28][29] show that parametric resonance can be effective also for a periodic potential if the initial angle is very close to the top of the potential. Furthermore, refs.…”

Section: Jcap10(2023)068 1 Introductionmentioning

confidence: 99%

ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures

Chatrchyan,

Eröncel,

Koschnitzke

et al. 2023

J. Cosmol. Astropart. Phys.

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Axion-like particles (ALPs) are leading candidates to explain the dark matter in the universe. Their production via the misalignment mechanism has been extensively studied for cosine potentials characteristic of pseudo-Nambu-Goldstone bosons. In this work we investigate ALPs with non-periodic potentials, which allow for large misalignment of the field from the minimum. As a result, the ALP can match the relic density of dark matter in a large part of the parameter space. Such potentials give rise to self-interactions which can trigger an exponential growth of fluctuations in the ALP field via parametric resonance, leading to the fragmentation of the field. We study these effects with both Floquet analysis and lattice simulations. Using the Press-Schechter formalism, we predict the halo mass function and halo spectrum arising from ALP dark matter. These halos can be dense enough to produce observable gravitational effects such as astrometric lensing, diffraction of gravitational wave signals from black hole mergers, photometric microlensing of highly magnified stars, perturbations of stars in the galactic disk or stellar streams. These effects would provide a probe of dark matter even if it does not couple to the Standard Model. They would not be observable for halos predicted for standard cold dark matter and for ALP dark matter in the standard misalignment mechanism. We determine the relevant regions of parameter space in the (ALP mass, decay constant)-plane and compare predictions in different axion fragmentation models.

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Section: Jcap10(2023)068 1 Introductionmentioning

confidence: 99%

ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures

Chatrchyan,

Eröncel,

Koschnitzke

et al. 2023

J. Cosmol. Astropart. Phys.

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show abstract

“…In these cases, the transformation to polar variables reveals that the field oscillations are encoded in trigonometric functions of the angular variable, and then the correct late‐time solutions are recovered by neglecting them. This technique has been successfully applied for scalar field models with different potentials (Cedeño et al 2017; Cedeño & Ureña‐López 2021; Ureñ a‐López 2019; Ureña‐López & Gonzalez‐Morales 2016).…”

Section: Introductionmentioning

confidence: 99%

Numerical approximations for the dynamics of cosmological scalar fields with a quartic self‐interaction

Ureña–López

2022

Astron Nachr

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In this paper, I present a new representation of the cosmological equations of motion for a cosmic scalar field endowed with a composite potential, which contains two terms: one quadratic and one quartic, and show that it can be transformed into a suitable dynamical system under a spherical change of variables. I discuss the features of the solutions and the critical points of the new system in the case of a single‐field model, and make a comparison with direct solutions of the Klein‐Gordon equation. Also, the case of rapid field oscillations is considered, together with the proposal to cut them off from the numerical solutions.

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Cosmological structure formation and soliton phase transition in fuzzy dark matter with axion self-interactions

Mocz

Fialkov

Vogelsberger

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We investigate cosmological structure formation in Fuzzy Dark Matter (FDM) with an attractive self-interaction (SI) with numerical simulations. Such a SI would arise if the FDM boson were an ultra-light axion, which has a strong CP symmetry-breaking scale (decay constant). Although weak, the attractive SI may be strong enough to counteract the quantum ‘pressure’ and alter structure formation. We find in our simulations that the SI can enhance small-scale structure formation, and soliton cores above a critical mass undergo a phase transition, transforming from dilute to dense solitons.

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One‐parametric description for scalar field dark matter potentials

Cited by 6 publications

References 63 publications

ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures

ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures

Numerical approximations for the dynamics of cosmological scalar fields with a quartic self‐interaction

Cosmological structure formation and soliton phase transition in fuzzy dark matter with axion self-interactions

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