How the HESS J1731-347 event could be explained using ${\mathbf{K}}^{-}$ condensation

Abstract

The recent observation of a compact star with a mass of $M=0.77_{-0.17}^{+0.20}{\mathrm{M}}_{\odot }$ and a radius of $R=10.4_{-0.78}^{+0.86}$ km, located within the supernova remnant HESS J1731-347, has substantially reinforced the evidence for the presence of exotic matter in neutron stars core. This finding has markedly enhanced our comprehension of the equation of state for dense nuclear matter. In the present work, we investigate the possible existence of a kaon condensation in hadronic neutron stars by employing and comparing two theoretical frameworks: the Relativistic Mean Field model with first order kaon condensate and the Momentum-Dependent Interaction model complemented by chiral effective theory. To the best of our knowledge, this represents a first alternative attempt aimed to explain the bulk properties of the specific object with the inclusion of a kaon condensation in dense nuclear matter. The application of two different models enriches the research, providing insights from the aspect of different theoretical frameworks that accurately predict the existence of HESS J1731-347. In both cases significant insights are extracted for the parameter space of models, emphasizing to those concerning the nucleon-kaon potential, the threshold density for the appearance of a kaon condensation, as well as the parameter $a_3{m}_s$ which is related to the strangeness content of the proton. Concluding, the present research indicates that a more systematic investigation of similar objects could offer valuable constraints on the properties of dense nuclear matter.

v1: 9 pages, 7 figures, 1 table. v2: 9 pages, 7 figures, 1 table, updated text; accepted for publication in Physics Letters B

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Cited by in corpus (8)

• Confronting new NICER mass-radius measurements with phase transition in dense matter and twin compact stars
• Is the central compact object in HESS J1731-347 a hybrid star with a quark core? An analysis with the constant speed of sound parametrization
• Analyzing the dense matter equation of states in the light of the compact object HESS J1731-347
• Exploring $\Delta$-resonance in neutron stars: implications from astrophysical and nuclear observations
• Simultaneous explanation of XTE J1814-338 and HESS J1731-347 objects using $K^{-}$ and ${\bar{K}}^0$ condensates
• Properties of the Object HESS J1731-347 as a Twin Compact Star
• Kaon-meson coupling from SU(3) flavour symmetry and application to antikaon condensed dense matter in neutron star
• Examining the possibility of a thick crust in the compact stellar object HESS J1731-347