TY - JOUR

T1 - Complexity and neutron stars with crust and hyperon core

AU - Adhitya, H.

AU - Sulaksono, A.

N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.

PY - 2020/7/14

Y1 - 2020/7/14

N2 - Continuing the work of K. Ch. Chatzisavvas and others [1], a measure of complexity proposed by R. López-Ruiz, H.L Mancini, and X. Calbet [2] is used to study a model of neutron star (NS) with crust and hyperon core. We employed the relativistic-mean-field approximation theory to build the Lagrangian density model of the neutron star's core and from it, obtained the equation of state (EoS), ∈(ρ). This ∈(ρ) was then put into the complexity equation and the complexity-values were obtained using numerical methods. Plotted against the corresponding mass values, the results show that neutron star's complexity-mass curves behave very similarly to an isolated-system phase complexity diagram, which was not apparent in the previous work by Chatzisavvas et al.. The reason for this is that the crust EoS put an upper limit to the complexity value and it follows that the crust itself is an ordered system of low complexity. We also show that NS have the properties of a perfect crystal although they are modeled as liquid.

AB - Continuing the work of K. Ch. Chatzisavvas and others [1], a measure of complexity proposed by R. López-Ruiz, H.L Mancini, and X. Calbet [2] is used to study a model of neutron star (NS) with crust and hyperon core. We employed the relativistic-mean-field approximation theory to build the Lagrangian density model of the neutron star's core and from it, obtained the equation of state (EoS), ∈(ρ). This ∈(ρ) was then put into the complexity equation and the complexity-values were obtained using numerical methods. Plotted against the corresponding mass values, the results show that neutron star's complexity-mass curves behave very similarly to an isolated-system phase complexity diagram, which was not apparent in the previous work by Chatzisavvas et al.. The reason for this is that the crust EoS put an upper limit to the complexity value and it follows that the crust itself is an ordered system of low complexity. We also show that NS have the properties of a perfect crystal although they are modeled as liquid.

UR - http://www.scopus.com/inward/record.url?scp=85089851616&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/1572/1/012012

DO - 10.1088/1742-6596/1572/1/012012

M3 - Conference article

AN - SCOPUS:85089851616

VL - 1572

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 1

M1 - 012012

T2 - 9th International Conference on Theoretical and Applied Physics, ICTAP 2019

Y2 - 26 September 2019 through 28 September 2019

ER -