The Snapping Cable of Reality: How Finite String Thickness Accelerates Quantum Decay and Reshapes the Gravitational Hum ✦

Original: "The decay rate of metastable cosmic strings beyond the thin-string approximation"

arXiv:2606.03008v1 · 2026-06-02 · CC BY · ⏱ 1 min · HEP Phenomenology Cosmology HEP Theory

A precise lattice calculation reveals: the finite thickness of cosmic strings accelerates their quantum decay by orders of magnitude, shifting the peak of gravitational waves to higher frequencies and giving terrestrial detectors a new chance to catch a signal from the early Universe.

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Cosmic strings are perhaps the tautest objects in the history of creation. Every centimeter is compressed by a monstrous force of a million tons. Their snapping is a quantum vanishing act, a leap from existence into nothing. We used to think this process dragged on for eons; now we know it’s swift. Too swift to sound the bass notes in the gravitational chorus. Yet it’s this hurried death that gives ground-based detectors hope—to catch their high, piercing final chord.

🎯 If you stretched a cosmic string along Earth’s equator, its total mass would rival a small asteroid, yet its thickness would remain a billion times smaller than an atom. Step on it, and your foot would pass through like a shadow, feeling no obstacle.

S_B^{(\mathrm{PV})} = \frac{\pi m_M^2}{\mu}

S_B — bounce action, m_M — monopole mass, μ — string tension

\Gamma \propto \exp(-S_B)

Γ — decay probability per unit time, exponentially suppressed by the action S_B

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The Snapping Cable of Reality: How Finite String Thickness Accelerates Quantum Decay and Reshapes the Gravitational Hum ✦