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arXiv · 2606.02511

Dyonic Quark Stars in Quasi-Topological Electromagnetism

Michael Gammon·Nicola De Kock·Robert B. Mann·Amos Kubeka
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Abstract

In this paper we consider quark star solutions to Liu et al.'s \cite{Liu_2019} quasi-topological electromagnetism (QTEM), a recently proposed form of dark energy. Since the QTEM contribution is trivial for pure electric/magnetic charge, we consider the dyonic case in pure QTEM which does induce (dark) non-trivial dynamics from the non-linear theory. Besides the introduction of a dyonic charge distribution generally pushing the characteristic quark star `hook' shape to larger masses and radii, it also induces a second branch at very large mass and radius for stars with a small dyonic charge ratio. This second set of solutions have a negative pressure envelope surrounding a positive pressure core. As we explore the parameter space these features interact and evolve in interesting ways, with the two branches eventually merging in $M/R$ space before settling into a characteristic `paperclip' shape as the dyonic charge ratio becomes large.

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Michael Gammon, Nicola De Kock, Robert B. Mann, Amos Kubeka. 2026-06-01. Dyonic Quark Stars in Quasi-Topological Electromagnetism. https://arxiv.org/abs/2606.02511

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