Anisotropic spheres via embedding approach in Ricci inverse gravity

IF 1.6 3区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS

High Energy Density Physics Pub Date : 2025-05-26 DOI:10.1016/j.hedp.2025.101196

Adnan Malik , Amjad Hussain , Ayesha Almas , M. Farasat Shamir , Fatemah Mofarreh

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引用次数: 0

Abstract

We present a class of anisotropic and spherically symmetric solutions characterized by the function

f (R, A) = R + α A

, where

R

is the Ricci scalar,

A

is the anticurvature scalar, and

α

is the coupling constant. The model is constructed by applying the Karmarkar condition to determine the radial metric coefficient and assuming a specific form for the temporal metric coefficient. Boundary conditions are derived to guarantee the continuity of spacetime, utilizing the Schwarzschild solution as the exterior spacetime. A detailed analysis of various physical properties, including energy density, pressure components, anisotropic pressure, energy conditions, the equation of state, mass function, surface redshift, compactness factor, adiabatic index, sound speed, and the Tolman–Oppenheimer–Volkoff equilibrium condition, is conducted. The complete analysis is applied to two well-known stars, Her X1 and Cen X3. The results demonstrate that all physical criteria are satisfied, confirming that the solutions are physically viable and consistent with established theoretical expectations.

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基于Ricci反重力的各向异性球体嵌入方法

给出了一类具有f(R, a)=R+α a特征的各向异性球对称解，其中R为Ricci标量，a为反曲率标量，α为耦合常数。该模型采用Karmarkar条件确定径向度量系数，并假定时间度量系数的特定形式。利用史瓦西解作为外部时空，导出了保证时空连续性的边界条件。详细分析了各种物理性质，包括能量密度、压力分量、各向异性压力、能量条件、状态方程、质量函数、表面红移、致密系数、绝热指数、声速和Tolman-Oppenheimer-Volkoff平衡条件。完整的分析应用于两颗著名的恒星，Her X1和Cen X3。结果表明，所有的物理标准都得到满足，证实了解决方案在物理上是可行的，并与建立的理论期望一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Energy Density Physics PHYSICS, FLUIDS & PLASMAS-

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： High Energy Density Physics is an international journal covering original experimental and related theoretical work studying the physics of matter and radiation under extreme conditions. ''High energy density'' is understood to be an energy density exceeding about 1011 J/m3. The editors and the publisher are committed to provide this fast-growing community with a dedicated high quality channel to distribute their original findings. Papers suitable for publication in this journal cover topics in both the warm and hot dense matter regimes, such as laboratory studies relevant to non-LTE kinetics at extreme conditions, planetary interiors, astrophysical phenomena, inertial fusion and includes studies of, for example, material properties and both stable and unstable hydrodynamics. Developments in associated theoretical areas, for example the modelling of strongly coupled, partially degenerate and relativistic plasmas, are also covered.