Dilaton-Induced Resonant Production of Ultralight Vector Dark Matter
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2026
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| author | Khan, Imtiaz Mustafa, G. Zafar, Jehanzad Atamurotov, Farruh Abdujabbarov, Ahmadjon Yuan, Chengxun |
| author_facet | Khan, Imtiaz Mustafa, G. Zafar, Jehanzad Atamurotov, Farruh Abdujabbarov, Ahmadjon Yuan, Chengxun |
| contents | We study the resonant production of ultralight vector dark matter from an oscillating spectator scalar $ϕ$ coupled to a massive vector $A_μ$ through a dilatonic kinetic function $\W(ϕ)$. The mechanism contains a narrow branch near $\mA/\mphi\simeq 1/2$. Assuming that the spectator remains subdominant until oscillations begin, we derive the onset fraction $r_i=\Phii^2/(6\Mpl^2)$ and show that, in the linear regime and for a background with constant equation-of-state parameter $w_b$, the growth-to-Hubble ratio scales as $μ/H\propto a^{3w_b/2}$. Combined with the tuned-branch abundance estimate, this implies $m_{γ'}\propto r_i^{-2}$ for the relic dark-photon mass. In particular, the interval $m_{γ'}\sim10^{-20}$--$10^{-18}\,\mathrm{eV}$ maps to $r_i\sim10^{-4}$--$10^{-5}$, corresponding to a radiation-dominated onset with a subdominant spectator, while for $M=10^{17}\,\mathrm{GeV}$ the perturbative range $ε_i=0.1$--$1$ gives $m_{γ'}\sim10^{-17}$--$10^{-21}\,\mathrm{eV}$. We also derive the polarization-resolved quadratic action in an FLRW background and formulate ultraviolet consistency conditions for both Stückelberg and Higgs completions, including perturbative control of the kinetic modulation, dark-Higgs decoupling, and symmetry-restoration bounds from vector backreaction. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_20481 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Dilaton-Induced Resonant Production of Ultralight Vector Dark Matter Khan, Imtiaz Mustafa, G. Zafar, Jehanzad Atamurotov, Farruh Abdujabbarov, Ahmadjon Yuan, Chengxun High Energy Physics - Phenomenology We study the resonant production of ultralight vector dark matter from an oscillating spectator scalar $ϕ$ coupled to a massive vector $A_μ$ through a dilatonic kinetic function $\W(ϕ)$. The mechanism contains a narrow branch near $\mA/\mphi\simeq 1/2$. Assuming that the spectator remains subdominant until oscillations begin, we derive the onset fraction $r_i=\Phii^2/(6\Mpl^2)$ and show that, in the linear regime and for a background with constant equation-of-state parameter $w_b$, the growth-to-Hubble ratio scales as $μ/H\propto a^{3w_b/2}$. Combined with the tuned-branch abundance estimate, this implies $m_{γ'}\propto r_i^{-2}$ for the relic dark-photon mass. In particular, the interval $m_{γ'}\sim10^{-20}$--$10^{-18}\,\mathrm{eV}$ maps to $r_i\sim10^{-4}$--$10^{-5}$, corresponding to a radiation-dominated onset with a subdominant spectator, while for $M=10^{17}\,\mathrm{GeV}$ the perturbative range $ε_i=0.1$--$1$ gives $m_{γ'}\sim10^{-17}$--$10^{-21}\,\mathrm{eV}$. We also derive the polarization-resolved quadratic action in an FLRW background and formulate ultraviolet consistency conditions for both Stückelberg and Higgs completions, including perturbative control of the kinetic modulation, dark-Higgs decoupling, and symmetry-restoration bounds from vector backreaction. |
| title | Dilaton-Induced Resonant Production of Ultralight Vector Dark Matter |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.20481 |