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Q-ball candidates for self-interacting dark matter
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We show that non-topological solitons, known as Q-balls, are promising candidates for self-interacting dark matter. They can satisfy the cross-section requirements for a broad range of masses. Unlike previously considered examples, Q-balls can stick together after collision, reducing the effective self-interaction rate to a negligible value after a few collisions per particle. This feature modifies predictions for halo formation. We also discuss the possibility that Q-balls have large interaction cross-sections with ordinary matter.
Forward citations
Cited by 6 Pith papers
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Early-Time Nonlinear Growth in an Unstable Q-Ball Hairy Black Hole
The early growth of the weakly responding scalar component in an unstable Q-ball hairy black hole is dominated by a second-order QNM sourced by the linear unstable mode, even while evolution remains perturbative.
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Dynamical flattening of halo density cusps by Q-ball dark matter
Interacting Q-ball dark matter flattens NFW cusps via density-dependent mergers that convert rest mass into escaping relativistic dark-sector particles, preferentially in halo centers.
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Quantum-Corrected Q-balls in the Friedberg-Lee-Sirlin Model
Hartree quantum fluctuations in 3+1D simulations of the Friedberg-Lee-Sirlin model produce a regime where fluctuations carry significant Noether charge, periodic charge exchange occurs, and some classically stable Q-b...
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Towards the Direct Detection of Composite Ultraheavy Dark Matter in Quantum Sensor Arrays
A quantum sensor array could be sensitive to Planck-mass composite dark matter with radii around a centimeter via Yukawa forces, with a signal that scales as λ² instead of exponentially for short screening lengths.
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Hydrodynamic properties in soliton field theory
Soliton formation in complex scalar field theory is framed as sound-mode-induced phase separation, and cylindrical Q-strings are shown to suffer a Rayleigh-Plateau membrane instability that breaks them into spheres.
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Gravitational Wave Spectrum from the Production of Dark Matter via the freeze-in Mechanism
Graviton bremsstrahlung during freeze-in dark matter production yields a high-frequency gravitational wave background peaking near 5.35 x 10^10 Hz, with UV freeze-in amplitudes up to Omega_GW h^2 ~ 1e-17.
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