Properties of hyperonic matter in strong magnetic fields

TL;DR

This paper investigates how extremely strong magnetic fields influence hyperonic matter's properties using relativistic mean field theory, revealing significant effects on hyperon thresholds and equation of state softening at ultra-strong fields.

Contribution

It introduces the impact of strong magnetic fields on hyperonic matter, incorporating hidden-strangeness mesons and hyperon potentials within the relativistic mean field framework, advancing hypernuclear physics understanding.

Findings

Magnetic fields above 5×10^{18} G significantly affect hyperon thresholds.

Strong magnetic fields reduce the softening of the equation of state caused by hyperons.

Hyperonic matter properties are notably altered under ultra-strong magnetic fields.

Abstract

We study the effects of strong magnetic fields on the properties of hyperonic matter. We employ the relativistic mean field theory, which is known to provide excellent descriptions of nuclear matter and finite nuclei. The two additional hidden-strangeness mesons, $\sigma^{\ast}$ and $\phi$, are taken into account, and some reasonable hyperon potentials are used to constrain the meson-hyperon couplings, which reflect the recent developments in hypernuclear physics. It is found that the effects of strong magnetic fields become significant only for magnetic field strength $B>5 \times 10^{18}$ G. The threshold densities of hyperons can be significantly altered by strong magnetic fields. The presence of hyperons makes the equation of state (EOS) softer than that in the case without hyperons, and the softening of the EOS becomes less pronounced with increasing magnetic field strength.