Constructing a neutron star in G2-QCD

Abstract

The inner structure of neutron stars is still an open question. To make progress and understand the qualitative impact of gauge interactions on the neutron star structure we study neutron stars in a modified version of QCD. In this modification the gauge group of QCD is replaced by the exceptional Lie group G${}_2$, which has neutrons and is accessible at finite density in lattice calculations. Using an equation of state constructed from lattice calculations we determine the mass-radius-relation for a neutron star in this theory using the Tolman-Oppenheimer-Volkoff equation. The results exhibit an influence of the non-trivial interactions on the mass-radius relation. However, the masses of the quarks are found to have little influence. We also give density profiles and the phase structure inside the neutron star. If the results carry over to full QCD, much of the internal structure of neutron stars could already be inferred from a precise measurement of the mass-radius relation.

(23 pages, 32 figures), Improved presentation, version to appear in European Physical Journal A

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Cited by in corpus (5)

• QCD thermodynamics from lattice calculations with non-equilibrium methods: The SU(3) equation of state
• Finite-density gauge correlation functions in QC2D
• An Exceptional G(2) Extension of the Standard Model from the Correspondence with Cayley-Dickson Algebras Automorphism Groups
• The Resurgence of the G(2) Group for the Strong Sector and the Emergence of Dark Matter
• Strongly Interacting Dark Matter admixed Neutron Stars