Bose$ndash$Einstein condensation in dense nuclear matter and strong magnetic fields

Abstract

Bose-Einstein condensation of antikaons in cold and dense beta-equilibrated matter under the influence of strong magnetic fields is studied within a relativistic mean field model. For magnetic fields > 5 × 10 18 G, the phase spaces of charged particles are modified resulting in compositional changes in the system. The threshold density of K − condensation is shifted to higher density compared with the field free case. In the presence of strong fields, the equation of state becomes stiffer than that of the zero field case.

Quark-meson coupling model for antikaon condensation in neutron star matter with strong magnetic fields

“…We note that the results of the TM1 model shown in Refs. [11,16] can be obtained using twice lower g ρN than given in Ref. [31].…”

“…To show how the results depend on the models based on different degrees of freedom, we make a systematic comparison between the QMC model and the RMF model with the TM1 parameter set [31]. As a nonlinear version of the RMF model, the TM1 model has been widely used in many studies of nuclear physics [11,[32][33][34][35]. The TM1 045804-4 model includes nonlinear terms for both σ and ω mesons, and its parameters were determined by reproducing the properties of nuclear matter and finite nuclei including neutron-rich nuclei [31].…”

“…So far, there is no direct observational evidence for the internal magnetic fields of the star, while it may reach 10 18 G, as estimated in some theoretical works [3][4][5]. Motivated by a possible existence of strong magnetic fields in neutron stars, theoretical studies on the effects of extremely large fields on dense matter have been carried out by many authors [1,3,[5][6][7][8], and the inclusion of hyperons and boson condensation has also been investigated [9][10][11]. There have been some works that investigate the effects of strong magnetic fields on neutron star properties [4,5].…”

Neutron star matter in the quark-meson coupling model in strong magnetic fields

“…The TM1 model was determined in Ref. [24] by reproducing the properties of nuclear matter and finite nuclei including neutron-rich nuclei, and has been widely used in many studies of nuclear physics [13,26,27,28]. We show the results with and without the inclusion of nucleon anomalous magnetic moments in the right and left panels, respectively.…”

The medium effect of magnetic moments of baryons on the neutron star under strong magnetic fields

“…Many studies for neutron stars with strong magnetic fields have been reported by several papers, which included the electromagnetic interaction, the Landau quantization of charged particles, and anomalous magnetic moments (AMMs) of baryons [2,3,4,5,6,7,8]. But roles of relevant particles' AMMs in a strong magnetic field are still uncertain because properties of the AMMs in nuclear matter are not fully scrutinized yet.…”