کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8186370 | 1528773 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Competition between delta isobars and hyperons and properties of compact stars
ترجمه فارسی عنوان
مسابقه بین ایزابارهای دلتای و هیپرنرها و خواص ستاره های جمع و جور
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کلمات کلیدی
معادله ایالت، ماده چگال، رزونانس دلتا، ستاره های فشرده،
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
چکیده انگلیسی
The Î-isobar degrees of freedom are included in the covariant density functional (CDF) theory to study the equation of state (EoS) and composition of dense matter in compact stars. In addition to Î's we include the full octet of baryons, which allows us to study the interplay between the onset of delta isobars and hyperonic degrees of freedom. Using both the Hartree and Hartree-Fock approximation we find that Î's appear already at densities slightly above the saturation density of nuclear matter for a wide range of the meson-Î coupling constants. This delays the appearance of hyperons and significantly affects the gross properties of compact stars. Specifically, Î's soften the EoS at low densities but stiffen it at high densities. This softening reduces the radius of a canonical 1.4Mâ star by up to 2 km for a reasonably attractive Î potential in matter, while the stiffening results in larger maximum masses of compact stars. We conclude that the hypernuclear CDF parametrizations that satisfy the 2Mâ maximum mass constraint remain valid when Î isobars are included, with the important consequence that the resulting stellar radii are shifted toward lower values, which is in agreement with the analysis of neutron star radii.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 783, 10 August 2018, Pages 234-240
Journal: Physics Letters B - Volume 783, 10 August 2018, Pages 234-240
نویسندگان
Jia Jie Li, Armen Sedrakian, Fridolin Weber,