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Related Experiment Video

Updated: Feb 18, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Gravitational Wave Memory from Binary Neutron Star Mergers.

Jamie Bamber¹, Antonios Tsokaros^1,2,3, Milton Ruiz⁴

¹University of Illinois Urbana-Champaign, Department of Physics, Urbana, Illinois 61801, USA.

Physical Review Letters

|February 16, 2026

Summary

Gravitational wave memory effects from binary neutron star mergers are significantly influenced by magnetic fields and ejected matter. These factors can alter the total memory by up to 50%, impacting future gravitational wave data analysis.

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Area of Science:

Astrophysics
Gravitational Wave Astronomy
Nuclear Physics

Background:

Gravitational wave signals from compact object mergers contain oscillatory and nonoscillatory components, including the memory effect.
The memory effect, a permanent displacement of test masses, remains unmeasured and its astrophysical origins are actively researched.

Purpose of the Study:

To quantify the impact of magnetic fields, neutrino emission, and ejected mass on gravitational wave memory in binary neutron star mergers.
To investigate the linear and nonlinear displacement memory effects in these extreme astrophysical events.

Main Methods:

Utilized general relativistic magnetohydrodynamic simulations incorporating neutrinos and various equations of state.
Analyzed the contributions of electromagnetic radiation, neutrinos, and baryonic ejecta to the memory effect.

Main Results:

Additional contributions to memory can reach ~15% for moderate magnetic fields and up to ~50% for extreme fields.
The equation of state, binary mass, and magnetic field strength are key factors influencing the memory effect.
Electromagnetic fields can alter gravitational wave luminosity and null memory, sometimes reducing total memory compared to non-magnetized binaries.

Conclusions:

Magnetic fields and equations of state are crucial for accurate gravitational wave memory data analysis.
Unlike binary black hole mergers, binary neutron star memory growth is prolonged by electromagnetic fields, neutrinos, and ejecta emission timescales.