Supersymmetric Hidden Sector Phase Transitions Could Produce Detectable Gravitational Waves
Researchers propose that supercooled first-order phase transitions in a supersymmetric hidden sector could generate gravitational waves observable by next-generation detectors like the Einstein Telescope and Cosmic Explorer. The model relies on radiatively-generated barriers along flat directions in supersymmetry, with signal strength depending sensitively on coupling parameters between hidden and visible sectors. This work connects gravitational wave signatures to dark matter production mechanisms, potentially providing a multi-messenger probe of physics beyond the Standard Model.
A new theoretical study examines how supercooled first-order phase transitions in a hidden sector with spontaneously broken U(1)_X symmetry could produce gravitational waves in frequency ranges accessible to future detectors. The model is built on supersymmetric flat directions where the tree-level quartic coupling vanishes, requiring radiative corrections from soft supersymmetry-breaking terms to generate the phase transition barrier. The predicted gravitational wave amplitude depends critically on the portal coupling strength between hidden and visible sectors, ranging from near detector sensitivity thresholds (10^-6 coupling) to stronger signals (10^-4 coupling) depending on initial thermal conditions. The authors track the phase transition dynamics using an 11-variable Boltzmann system that separately models the cold nucleating phase and reheated true-vacuum interior. The same hidden sector framework can simultaneously explain dark matter abundance through relativistic dark-quark freeze-out followed by entropy dilution, suggesting a unified picture connecting gravitational wave signals to dark matter production.
What's missing
The study does not discuss potential experimental challenges in distinguishing this signal from other gravitational wave sources, nor does it compare predicted signal strengths quantitatively to known astrophysical backgrounds or other theoretical models of gravitational wave production. The paper also does not address how current constraints from cosmological observations (e.g., CMB, BBN) limit the viable parameter space.
What different sources said
- arXiv astro-phCenter
Natural Supercooling and Reheating along Supersymmetric Flat Directions and Observable Gravitational Waves at the Einstein Telescope and the Cosmic Explorer
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