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Rong-Gen Cai

2 articles · 4 co-authors · latest: 2026-06-09

Ghost Stars as Precise Cosmic Clocks

Astrophysicists have shown that hypothetical boson stars—clumps of the lightest particles—can act as gravitational lenses with their own rhythm. The breathing lens oscillates its focus, and any light source caught in it begins to blink rhythmically. This can be tested with modern telescopes, offerin
arXiv:2511.19606 · 2025-11-24

Black Hole as a Gravitational Atom: Gravitational Echo

A spinning black hole accumulates a cloud of nearly weightless particles—a gravitational atom. A faint gravitational wave makes them synchronously "fall" from high orbits, creating a delayed burst. This flare is a key to detecting dark matter.
arXiv:2606.10776 · 2026-06-09