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Wandering Black Hole Caught Feeding on the Run
Confirmed
In Short: A team of researchers has developed a new method to detect 'black hole hair,' potentially revealing the presence of exotic matter or deviations from general relativity.
Scientists have devised a novel approach to detect 'black hole hair,' the hypothetical matter or exotic fields surrounding a black hole, by analyzing changes in gravitational wave patterns known as ringdown waves. According to Ariadna Uxue Palomino Ylla, a Ph.D. student at Nagoya University and lead author of the study, 'Black hole hair may represent matter surrounding the black hole, or deviations from the simplest kind of black hole predicted by general relativity.
The researchers, including Palomino Ylla, used the well-established link between a black hole's ringdown and the orbits of light bent around it to calculate how the hair would shift the wave's oscillation frequency and its damping rate. 'The ringdown waves may not only show that something extra is affecting the black hole; the way the signal changes could also give us clues about what this hidden matter is actually like,' Palomino Ylla explained.
Rotation complicates these calculations, as light circling with the black hole's spin behaves differently from light circling against it. 'Rotation makes calculations more complex because these may slightly change the ringdown signal, and detecting or ruling out these changes could give us a new way to test gravity in this extreme region,' the researchers noted.
Previous efforts often relied on a mathematical model called Fisher matrices to make guesses about whether new telescopes could detect properties of very early black hole mergers. This new method, however, provides a more direct way to test for the presence of black hole hair, potentially revealing the nature of the matter or fields surrounding these cosmic giants.
What's still developing
- When two black holes merge, the resulting object rings like a struck bell, radiating gravitational waves that fade in a distinctive pattern called ringdown.
- And they died young, in many cases collapsing into the universe’s earliest black holes.
- Some of those black holes even partnered up, eventually colliding into one another and creating gravitational waves that, if we have instruments sensitive enough, we could potentially detect.