Dancing Dispersion: The Millisecond Life of a Neutron Star ✦

Original: "FRB20250613A: a remarkable repeating FRB with apparent millisecond-timescale scattering variations"

· T. Dial, A. T. Deller, Alexa C. Gordon, P. A. Uttarkar, R. M. Shannon, Ziteng Wang, M. Caleb, Wen-fai Fong, Marcin Glowacki, Kelly Gourdji, Joscha N. Jahns-Schindler

arXiv:2607.00505v1 · 2026-07-01 · CC BY 4.0 · ⏱ 1 min · High Energy

FRB 20250613A — a repeating fast radio burst — gives itself away in a split second: its dispersion jumps 50-fold, revealing a plasma storm around a neutron star.

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A neutron star spins 147 times a second, but its radio beam punches through a plasma wind that changes faster than you can blink. Some bursts drown in the fog, others — super-powerful — burn their way through. Someday, the dance of this beam will become our compass in the search for the hidden matter of the Universe.

🎯 Each click of FRB 20250613A packs the energy of an entire day of the Sun into a thousandth of a second. If you blink, you'll miss about two hundred spins of the neutron star.

p_m = p \exp(-2\sigma_{RM}^2 \lambda^4)

Polarization fades with wavelength, like picture sharpness through the shimmering air above hot asphalt.

a_0 = \frac{e E_0}{m_e c \omega}

Dimensionless field amplitude: when it exceeds unity, electrons become relativistic and the plasma opens up like gates — the beam burns through the fog.

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Dancing Dispersion: The Millisecond Life of a Neutron Star ✦