FRB 20240114A shows a ~112-day periodic modulation in central emission frequency with systematic upward drift within each period at >6σ significance.
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Relativistic single-particle scattering cross sections for strong electromagnetic waves in strongly magnetized plasma are computed for arbitrary polarization and angle, showing strong suppression and sub-unity optical depth for quasi-parallel propagation.
Model-independent constraints expose kinetic-luminosity and induced-Compton optical-depth bottlenecks that rule out or severely limit external-shock and light-cylinder reconnection FRB models while favoring magnetospheric scenarios with in-situ acceleration.
Matching FRB QPOs to crustal modes constrains the neutron star mass to 1.00-1.76 solar masses, radius to ~13 km, and nuclear symmetry energy slope L to 59.5-96.8 MeV.
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Periodic Emission Frequency Modulation in a Hyperactive Fast Radio Burst
FRB 20240114A shows a ~112-day periodic modulation in central emission frequency with systematic upward drift within each period at >6σ significance.