https://doi.org/10.1140/epjc/s10052-025-14193-y
Regular Article - Theoretical Physics
Quark star matter within an extended quasiparticle model
1
Research Center for Theoretical Physics, Science School, Qingdao University of Technology, 266033, Qingdao, China
2
College of Science, China University of Petroleum (East China), 266580, Qingdao, China
3
School of Science, Yanshan University, 066004, Qinhuangdao, China
4
School of Physical Science and Technology, Inner Mongolia University, 010021, Hohhot, China
5
School of Nuclear Science and Technology, University of South China, 421001, Hengyang, China
6
Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, 421001, Hengyang, China
Received:
18
December
2024
Accepted:
15
April
2025
Published online:
27
April
2025
In this work, we extend the quasiparticle model to include the chemical potential dependence of the coupling constant g and consider the density-dependent bag constant 
in order to satisfy the asymptotic freedom feature. By satisfying the absolutely stable condition at zero temperature, we draw the stability region of the strange quark matter (SQM) and describe the recently discovered pulsars PSR J0952-0607, PSR J2215+5135, PSR J0740+6620, 4U 1702-429, and HESS J1731-347 as quark stars (QSs) within the extended quasiparticle model. In particular, our results indicate that the polytropic index 
of the quark star matter becomes anisotropic with different magnetic field orientation distributions, and decreases with the increment of the maximum star mass of QSs at zero temperature or under the density-dependent magnetic fields within quasiparticle model.
© The Author(s) 2025
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