论文标题
重力标量极化和变色龙$ f（r）$重力的测试来自二元脉冲星的全面分析
Tests of gravitational scalar polarization and constraints of chameleon $f(R)$ gravity from comprehensive analysis of binary pulsars
论文作者
论文摘要
Chameleon $ f（r）$重力等于具有变色龙筛选机制的一类标量调整理论，允许该理论满足重力的局部测试。在Chameleon $ f（r）$的框架内，我们研究了变色龙机制对二元脉冲星轨道演变的影响，并详细计算了凯伯利亚后（PK）效应（Periastron Advance，Einstein Advance，Einstein延迟，Shapiro延迟，眶延迟，轨道延迟，轨道时期衰减和偏心衰减）。一般相对论（GR）和变色龙$ f（r）$之间的PK效应的差异优雅地通过Star的紧凑性和理论参数的组合来量化。我们使用质量 - 拉迪乌斯的关系来打破这两个参数之间的堕落，从而使我们能够限制理论。我们模拟了中子星（NS） - 白色矮人（WD）二进制的轨道周期和偏心率的时间演变，结果表明，由于Chameleon $ F（R）$中偶极辐射的发射，轨道的演化通常比GR中的GR快。我们使用来自三个NS-WD二进制脉冲星的PK参数的观察值来对变色龙$ F（R）$放置约束，并通过执行Monte-Carlo模拟来与GR偏离GR。我们发现PSR J1738 $+$ 0333是这些系统中Chameleon $ f（R）$的最严格测试。我们的结果没有表明存在螺旋性-0或Helicity-1极化状态诱导偶极子辐射的固体证据，排除了明显的强场偏差，并确认GR对于强场不对称系统仍然有效。
Chameleon $f(R)$ gravity is equivalent to a class of scalar-tensor theories of gravity with chameleon screening mechanism allowing the theory to satisfy local tests of gravity. Within the framework of chameleon $f(R)$, we study the impact of the chameleon mechanism on the orbital evolution of binary pulsars, and calculate in detail the post-Keplerian (PK) effects (periastron advance, Einstein delay, Shapiro delay, orbital period decay and eccentricity decay) of binary orbit. The differences in PK effects between general relativity (GR) and chameleon $f(R)$ are elegantly quantified by a combination of star's compactness and theory parameter. We use the mass-radius relation to break the degeneracy between these two parameters, thus allowing us to constrain the theory. We simulate the temporal evolution of the orbital period and eccentricity of neutron star (NS) - white dwarf (WD) binaries, and the results indicate that the orbital evolution is typically faster than in GR due to the emission of dipole radiation in chameleon $f(R)$. We use the observables of PK parameters from the three NS-WD binary pulsars to place constraints on chameleon $f(R)$ and possible deviations from GR by performing Monte-Carlo simulations. We find that PSR J1738$+$0333 is the most constraining test of chameleon $f(R)$ in these systems. Our results show no solid evidence of the existence of helicity-0 or helicity-1 polarization states inducing dipole radiation, exclude significant strong-field deviations and confirm that GR is still valid for strong-field asymmetric systems.
