MAGGIE: A Magnetic Gravitational Wave Induction Experiment
Abstract
Gravitational waves (GWs) can induce effective electromagnetic currents when interacting with external electric and magnetic fields, as described by linearized gravity modifications to Maxwell's equations. This coupling enables a novel detection approach for high-frequency gravitational waves (HFGWs) using axion haloscope experiments. Here we present the MAGnetic Gravitational wave Induction Experiment (MAGGIE), the first lumped-element HFGW detector proposed in Europe, designed to probe HFGWs in the kHz-MHz regime by leveraging a 14 T solenoidal magnet at the University of Hamburg. The GW-induced magnetic flux is captured by a custom-designed pickup loop optimized for the expected symmetry of the effective current. A figure-8-shaped geometry, oriented to break the azimuthal symmetry, is implemented, together with a blind-loop configuration, for real-time noise rejection and calibration. The readout scheme is tailored for continuous signals and time-domain transient searches, using waveform templates for primordial black hole (PBH) mergers. The expected experimental reach in terms of strain spectral noise density at the 40 MHz high-frequency end is projected to reach ∼ 4 × 10−16/√(Hz) for transient searches, and in terms of strain, projected to reach ∼ 10−19 for 1 year of continuous search. This allows MAGGIE to constrain currently unexplored regions of the HFGW parameter space.
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BibTeX
@misc{jodicke2026maggie,
title = {{MAGGIE: A Magnetic Gravitational Wave Induction Experiment}},
author = {Jasper Jödicke and Marios Maroudas and Toma-Stefan Cezar and Dieter Horns},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.30318},
eprint = {2609.30318},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.30318},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - MAGGIE: A Magnetic Gravitational Wave Induction Experiment
AU - Jasper Jödicke
AU - Marios Maroudas
AU - Toma-Stefan Cezar
AU - Dieter Horns
PY - 2026
DA - 2026/09/23
PB - arXiv
DO - 10.48550/arxiv.2609.30318
UR - https://arxiv.org/abs/2609.30318
AB - Gravitational waves (GWs) can induce effective electromagnetic currents when interacting with external electric and magnetic fields, as described by linearized gravity modifications to Maxwell's equations. This coupling enables a novel detection approach for high-frequency gravitational waves (HFGWs) using axion haloscope experiments. Here we present the MAGnetic Gravitational wave Induction Experiment (MAGGIE), the first lumped-element HFGW detector proposed in Europe, designed to probe HFGWs in the kHz-MHz regime by leveraging a 14 T solenoidal magnet at the University of Hamburg. The GW-induced magnetic flux is captured by a custom-designed pickup loop optimized for the expected symmetry of the effective current. A figure-8-shaped geometry, oriented to break the azimuthal symmetry, is implemented, together with a blind-loop configuration, for real-time noise rejection and calibration. The readout scheme is tailored for continuous signals and time-domain transient searches, using waveform templates for primordial black hole (PBH) mergers. The expected experimental reach in terms of strain spectral noise density at the 40 MHz high-frequency end is projected to reach ∼ 4 × 10^−16/√(Hz) for transient searches, and in terms of strain, projected to reach ∼ 10^−19 for 1 year of continuous search. This allows MAGGIE to constrain currently unexplored regions of the HFGW parameter space.
ER -