Physicists Devise New Way to Listen for ‘Hairy’ Black Holes
Physicists have developed a new method to detect 'hair' on black holes by analyzing the ringdown patterns of gravitational waves. This technique could help identify exotic matter or deviations from general relativity by measuring shifts in oscillation frequency and damping rates.
Why it matters
This research provides a potential new way to test the laws of gravity in extreme environments and could reveal the nature of dark matter or other hidden fields.
When two black holes merge, the resulting object rings like a struck bell, radiating gravitational waves that fade in a distinctive pattern called ringdown. According to general relativity, this pattern should depend only on the merged black hole’s mass and spin. But if a black hole carries extra structure — often called ‘hair’ — from surrounding dark matter, exotic fields, or modified gravity, the hair should leave its own fingerprint on the signal. Physicists from Nagoya University and Kindai University have now worked out a general method for predicting this fingerprint.
Palomino Ylla et al . found a way to check for black hole hair using changes in ringdown waves. Image credit: Nagoya University.
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