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Pluck a guitar string, and it will vibrate and quickly fade. Now imagine a cosmic string: an ultra-thin filament of pure energy left over from the Big Bang, trillions of times thinner than an atom and denser than a neutron star. Strike it, and it might sing for billions of years.

In a new study, physicists examined a special type of oscillation — not transverse vibrations, but waves running along the string itself, like sound along a taut rope. These are vector excitations, which behave like massive particles trapped on a one-dimensional filament. The researchers calculated their spectrum and shape, then traced how they decay. The damping follows a power law — slow, like a cup of coffee cooling, not like a soap bubble popping.

But the most surprising result came from full 3+1-dimensional simulations. The vector mode entered resonance with the Goldstone sector — massless oscillations that are usually 'eaten' by the Higgs mechanism. This triggered a parametric instability: the string began to sway in two transverse directions at once, like a pendulum that suddenly swings not only back and forth but also side to side. The effect was unexpected: earlier studies suggested that ordinary shape modes excite only one direction.

Thus, the cosmic string transforms from an abstract guitar metaphor into a complex musical instrument capable of polyphony. And its 'songs'—gravitational waves and bursts of radiation — might one day tell us about the first moments of the universe.