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Q-ball Superradiance

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arxiv 2212.03269 v2 pith:F2E56QRE submitted 2022-12-06 hep-th gr-qchep-ph

Paul M. Saffin , Qi-Xin Xie , Shuang-Yong Zhou This is my paper · ORCID
classification hep-thgr-qchep-ph
keywords superradiancescatteringangularenergymodesmomentumq-ballspace
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Q-balls are non-topological solitons that coherently rotate in field space. We show that these coherent rotations can induce superradiance for scattering waves, thanks to the fact that the scattering involves two coupled modes. Despite the conservation of the particle number in the scattering, the mismatch between the frequencies of the two modes allows for the enhancement of the energy and angular momentum of incident waves. When the Q-ball spins in real space, additional rotational superradiance is also possible, which can further boost the enhancements. We identify the criteria for the energy and angular momentum superradiance to occur.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Quantum fields in boson star spacetime

    gr-qc 2026-01 conditional novelty 6.0 of 10

    In boson star spacetimes, the renormalized quantum stress tensor has mostly positive energy density and negative radial pressure that grow with curvature, rivaling the classical stress in the most compact solutions.

  2. Q-ball perturbations with more details: linear analysis vs lattice

    hep-ph 2024-12 conditional novelty 6.0 of 10

    Q-ball perturbation theory is shown to remain valid for wavepacket amplitudes below about 10^-2 of the Q-ball background, and the analysis is extended to two-field FLS Q-balls.

  3. Hydrodynamic and Rayleigh-Plateau instabilities of Q-strings

    hep-th 2024-12 conditional novelty 6.0 of 10

    Cylindrical Q-strings are linearly unstable to long-wavelength axial perturbations, with a threshold that matches the Rayleigh-Plateau instability λc=2πR for thin-wall solitons.

  4. Non-topological solitons and quasi-solitons

    hep-th 2024-11 accept novelty 2.0 of 10

    A comprehensive review of non-topological solitons (Q-balls) and quasi-solitons (oscillons), their properties, dynamics, and roles in early-universe physics.

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