论文标题
$ f（r，l_m）$ gravity中的大型白矮人
Massive white dwarfs in $f(R,L_m)$ gravity
论文作者
论文摘要
在这项工作中，我们研究了在修饰的重力的背景下，即$ f（r，l_m）$ gravity，$ r $代表ricci stalcor，而$ l_m $ $ l_m $是Lagrangian Matter Legesity。我们专注于特定情况$ f（r，l_m）= r/2 + l_m +σrl_m$，即，我们考虑了重力场和物质场之间的非微耦合，其中$σ$是耦合常数。该理论首次应用于白矮人，特别是研究大型白矮人，这是过去几年引起的极大兴趣的话题。平衡构型预测高于Chandrasekhar质量极限的最大质量。该理论的最重要效果是显着增加半径<2000 km的恒星的质量。我们发现该理论可以容纳用于不同恒星组成的超级chandrasekhar白色矮人。除此之外，该理论还恢复了半径大于3000 km的恒星的一般相对性结果，而与$σ$的值无关。
In this work, we investigate the equilibrium configurations of massive white dwarfs (MWD) in the context of modified gravity, namely $f(R,L_m)$ gravity, where $R$ stands for the Ricci scalar and $L_m$ is the Lagrangian matter density. We focused on the specific case $f(R,L_m) = R/2 + L_m + σRL_m$, i.e., we have considered a non-minimal coupling between the gravity field and the matter field, with $σ$ being the coupling constant. For the first time, the theory is applied to white dwarfs, in particular to study massive white dwarfs, which is a topic of great interest in the last years. The equilibrium configurations predict maximum masses which are above the Chandrasekhar mass limit. The most important effect of the theory is to increase significantly the mass for stars with radius < 2000 km. We found that the theory can accommodate the super-Chandrasekhar white dwarfs for different star compositions. Apart from this, the theory recovers the General Relativity results for stars with radii larger than 3000 km, independent of the value of $σ$.
