Exploring physical properties of compact stars in f(R, T)-gravity: An embedding approach

• 作 者: Ksh.Newton Singh Abdelghani Errehymy Farook Rahaman Mohammed Daoud
• 机 构: Department of Physics, National Defence Academy, Khadakwasla, Pune-411023, India;Department of Mathe
• 出 处: 中国物理C（英文版）
• 发表日期: 2020年10期
• 关键词: f(R T)-gravity Karmarkar's condition exact solutions compact star

Solving field equations exactly in f(R,T)-gravity is a challenging task.To do so,many authors have adopted different methods such as assuming both the metric functions and an equation of state (EoS) and a metric function.However,such methods may not always lead to well-behaved solutions,and the solutions may even be rejected after complete calculations.Nevertheless,very recent studies on embedding class-one methods suggest that the chances of arriving at a well-behaved solution are very high,which is inspiring.In the class-one approach,one of the metric potentials is estimated and the other can be obtained using the Karmarkar condition.In this study,a new classone solution is proposed that is well-behaved from all physical points of view.The nature of the solution is analyzed by tuning the f(R,T)-coupling parameter xx,and it is found that the solution leads to a stiffer EoS for x =-1 than that for x =1.This is because for small values of x,the velocity of sound is higher,leading to higher values of Mmax in the M-R curve and the EoS parameter ω.The solution satisfies the causality condition and energy conditions and remains stable and static under radial perturbations (static stability criterion) and in equilibrium (modified TOV equation).The resulting M-R diagram is well-fitted with observed values from a few compact stars such as PSR J1614-2230,Vela X-1,Cen X-3,and SAX J1808.4-3658.Therefore,for different values ofx,the corresponding radii and their respective moments of inertia have been predicted from the M-I curve.