Are Aliens Harvesting the Spin of Stars?

• Advanced civilizations might harvest a star's rotational angular momentum—a concept called Stellar J-Harvesting—instead of capturing its light via a traditional Dyson sphere.
• This method is theoretically more "invisible" to current infrared surveys because it produces significantly less waste heat and requires fewer physical materials.
• Researcher Sahin Torlakcik identified two potential candidates (KIC 67606183 and KIC 9834255) showing unusually slow rotation speeds among 6,725 observed main-sequence stars.

Technical Concepts

• Alfvén-wave coupling: Embedding a conducting structure in the solar wind to extract momentum via magnetic field oscillations.
• Lorentz-force coupling: Using a massive orbital ring at 1 AU to interact with the star’s magnetic field, pushing against it to scavenge rotational energy.
• Synchrotron spindown: Placing conductive structures in the solar wind to accelerate charged particles to relativistic speeds, generating detectable radio or X-ray technosignatures while creating reactive torque that slows the star.

Study Findings

• Analysis focused on the Kepler field, filtering for FGK main-sequence stars while excluding subgiants and pre-main-sequence stars.
• Two candidate G-type stars were found to rotate in 61 and 65 days, whereas similar-age stars typically rotate every 5 to 10 days.
• The author notes these findings are likely due to natural astrophysical phenomena, such as unresolved binaries or low metallicity, rather than alien megastructures, but they warrant further observation.