Barnett effect as a new source of magnetic field in heavy-ion collisions

2025/10/06 by Sahu, Dushmanta
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.2510.05066

Abstract

The Barnett effect is a fundamental magnetomechanical phenomenon in which a ferromagnetic material becomes magnetized under rotation. Using a hadron resonance gas (HRG) model under rigid rotation, we compute the Barnett magnetization (M_{\rm Barnett}) and show that it produces a magnetic field (B_ind) comparable in magnitude to the well-known external field (B_ext) from spectator protons at low energy heavy-ion collisions. This finding establishes the Barnett effect as a previously overlooked but essential source of magnetization and magnetic field in the heavy-ion collisions, with profound implications for understanding spin dynamics and anomalous transport in quantum chromodynamics under extreme rotation.

Citations

• QCD with background electromagnetic fields on the lattice: a review
• Conserved number fluctuations under global rotation in a hadron resonance gas model

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