Early evolutionary tracks of low-mass stellar objects in modified gravity

Aneta Wojnar

备注：: A version accepted to PRD, 10 pages, one figure, one table
发表信息：: Phys. Rev. D 102, 124045 (2020)
DOI：: 10.1103/PhysRevD.102.124045

英文摘要：

Using a simple model of low-mass stellar objects we have shown modified gravity impact on their early evolution, such as Hayashi tracks, radiative core development, effective temperature, masses, and luminosities. We have also suggested that the upper mass' limit of fully convective stars on the Main Sequence might be different than commonly adopted.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

阅读原文

阅读 PDF ↗

arXiv 页面 ↗HTML 原文 ↗

本文内容

英文摘要相关论文

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

继续探索

相关论文

Modified gravity revealed along geodesic tracks

The study of the dynamics of a two-body system in modified gravity constitutes a more complex problem than in Newtonian gravity. Numerical methods are typically needed to solve the equations of geodesics. Despite the complexity of the problem, the study of a two-body system in $f(R)$ gravity leads to a new exciting perspective hinting the right strategy to adopt in order to probe modified gravity. Our results point out some differences between the {\em semiclassical} (Newtonian) approach, and the {\em relativistic} (geodesic) one thus suggesting that the latter represents the best strategy for…

2018-10-31astro-ph.HEgr-qc

修正引力中带电耗散结构的复杂度因子分析

Analysis of Complexity Factor for Charged Dissipative Configuration in Modified Gravity

本文在f(G,T)修正引力背景下，利用Herrera正交分解法分析带电辐射柱状天体的复杂度因子，发现电荷与修正项会提升系统复杂度。

2023-09-06gr-qc

在非动力学Chern-Simons修正重力和它的卫星-卫星跟踪任务测量中有偏距离的特征：理论研究

Signature of biased range in the non-dynamical Chern-Simons modified gravity and its measurements with satellite-satellite tracking missions: Theoretical studies

GRACE任务和计划中的GRACE后续任务在距离和距离变化率测量方面具有很高的精度，原则上可以用来对某些相对论引力理论进行强有力的约束。本文计算了星对星跟踪（SST）测量中非动力学Chern-Simons修正重力场的可观测距离。我们发现在非动力学的Chern-Simons引力中出现了一个特征的时间累积距离信号，这在标准的宇称保持度规引力理论中是没有的。对于这些SST任务的每次自由飞行，该Chern-Simons距离信号的幅度将达到$χcm$的几倍，这里$χ$是非动力学Chern-Simons理论的无量纲后牛顿参数。因此，利用GRACE卫星12年的观测数据，可以预期非动力学Chern-Simons引力的质量尺度$M_{CS}=\frac{4\hbar c}{χa}$可以被限制为大于$1.9\times10^{-9}eV$ .对于计划于2017年发射的GRACE FO任务，预计$M_{CS}\geq5\times10^{-7}eV$的约束要强得多。

2015-08-30gr-qchep-th

The Influence of Modification of Gravity on the Dynamics of Radiating Spherical Fluids

We explore the evolutionary behaviors of compact objects in a modified gravitational theory with the help of structure scalars. Particularly, we consider the spherical geometry coupled with heat and radiation emitting shearing viscous matter configurations. We construct structure scalars by splitting the Riemann tensor orthogonally in $f(R,T)$ gravity with and without constant $R$ and $T$ constraints, where $R$ is the Ricci scalar and $T$ is the trace of the energy-momentum tensor. We investigate the influence of modification of gravity on the physical meaning of scalar functions for radiating…

2016-03-10astro-ph.COgr-qchep-ph

基于卡西尼无线电跟踪数据对修正牛顿引力的约束改进

Improved constraints on modified Newtonian gravity from Cassini radio tracking data

Jet Propulsion Laboratory, California Institute of Technology（喷气推进实验室，加州理工学院）；Observatoire de Paris, Université PSL, Sorbonne Université, Université de Lille（巴黎天文台，巴黎文理研究大学，索邦大学，里尔大学）；Université de Strasbourg, CNRS UMR 7550, Observatoire astronomique de Strasbourg（斯特拉斯堡大学，法国国家科学研究中心，斯特拉斯堡天文台）；Institute of Cosmology & Gravitation, University of Portsmouth（宇宙学与引力研究所，朴茨茅斯大学）

基于卡西尼无线电跟踪数据，研究改进了对修正牛顿引力参数$Q_2$的约束，发现其比以往估计提高了40%，并揭示了太阳系内部MOND效应与观测结果的矛盾。

2026-07-29astro-ph.EPastro-ph.GAgr-qc