Nonminimally coupled ultralight axions as cold dark matter

Kishan, Sankharva,; Sethi, Shiv K.

doi:10.1103/physrevd.105.103517

Cited by 1 publication

(2 citation statements)

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“…As the universe expands and the DM density decreases, the importance of nonminimal couplings decreases and the standard scenario of perturbation evolution in wave DM is recovered, albeit with a slightly modified Jeans scale (3.11). Besides the growth of linear perturbations, the nonminimal coupling could also affect matter power spectrum, baryon acoustic oscillations, CMB spectrum, and BBN [47,67,144]. We leave the investigation of these topics for future work.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…It has been demonstrated that the inclusion of the nonminimal coupling is integral to the renormalization of field theories in JCAP07(2023)055 curved spacetime [49][50][51][52]. Moreover, the nonminimal terms are phenomenologically relevant and have been employed in the context of inflation [53][54][55][56][57][58][59], modified gravity [60][61][62][63][64][65], dark matter [28,[66][67][68] and dark energy [69,70].…”

Section: Introductionmentioning

confidence: 99%

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Phenomenology of wavelike vector dark matter nonminimally coupled to gravity

Zhang¹,

Ling²

2023

J. Cosmol. Astropart. Phys.

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We study three astrophysical/cosmological consequences of nonminimal couplings to gravity in wavelike vector dark matter. In the nonrelativistic limit, the nonminimal coupling with the lowest mass dimension leads to effective self-interactions that affect the mass-radius relation of vector solitons, growth of linear perturbations during structure formation, and the speed of gravitational waves (GWs). Based on the success of cold dark matter on large-scale perturbations and the current limits on GW speed, we constrain the dark matter mass and nonminimal coupling strength to be within the range |ξ 1|/m 2 ≪ 1050 eV-2 and -3 × 1046 eV-2 ≲ ξ 2/m 2 ≲ 8 × 1048 eV-2.

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Section: Summary and Discussionmentioning

confidence: 99%