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arXiv 1009.4876gr-qc
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辐射规范中绕Schwarzschild黑洞圆轨道粒子的保守引力自力

Conservative, gravitational self-force for a particle in circular orbit around a Schwarzschild black hole in a Radiation Gauge

Abhay Shah, Tobias Keidl, John Friedman, Dong-Hoon Kim, Larry Price

摘要:

这是计算辐射规范中的自作用力的两篇姊妹论文中的第二篇;更准确地说,该方法使用辐射规范来计算度规扰动的辐射部分,同时使用任意选择的规范来计算与黑洞质量和自旋变化以及质心移动相关的扰动部分。本文计算了在史瓦西黑洞圆轨道上的粒子的自作用力的保守部分。将我们的辐射规范与洛伦兹规范联系起来的规范矢量是螺旋对称的,这意味着量h_{αβ} u^αu^β(= h_{uu})对于我们的辐射规范和洛伦兹规范必须具有相同的值;我们在数值上证实了这一点,其精确度为10^{13}分之一。如第一篇论文所述,扰动度规是从赫兹势构造的,赫兹势是从延迟扰动自旋2的外尔标量,θ_0代数获得的。我们使用模和重整化,通过将L = \ell + 1/2中的一系列与延迟场h_{αβ} ^{ret}表示的自作用力的大L行为相匹配,找到重整化系数;我们同样找到h_{uu}的主导重整化系数以及由于自作用力而引起的粒子角速度的相关变化。我们用数值方法证明了自作用力的奇异部分的形式为f_α \propto < \nabla_α ρ^{-1}>,即\nabla_α ρ^{-1}关于通过粒子的径向线轴对称的部分.这与洛伦兹规范的形式仅相差一个常数。正是因为我们没有用辐射规范来描述黑洞质量的变化,所以自作用力的奇异部分沿着穿过粒子的径向线没有奇异性,并且至少在这个例子中,是对ρ的次引导阶球对称的。

英文摘要:

This is the second of two companion papers on computing the self-force in a radiation gauge; more precisely, the method uses a radiation gauge for the radiative part of the metric perturbation, together with an arbitrarily chosen gauge for the parts of the perturbation associated with changes in black-hole mass and spin and with a shift in the center of mass. We compute the conservative part of the self-force for a particle in circular orbit around a Schwarzschild black hole. The gauge vector relating our radiation gauge to a Lorenz gauge is helically symmetric, implying that the quantity h_{αβ} u^αu^β(= h_{uu}) must have the same value for our radiation gauge as for a Lorenz gauge; and we confirm this numerically to one part in 10^{13}. As outlined in the first paper, the perturbed metric is constructed from a Hertz potential that is in term obtained algebraically from the the retarded perturbed spin-2 Weyl scalar, ψ_0 . We use a mode-sum renormalization and find the renormalization coefficients by matching a series in L = \ell + 1/2 to the large-L behavior of the expression for the self-force in terms of the retarded field h_{αβ}^{ret}; we similarly find the leading renormalization coefficients of h_{uu} and the related change in the angular velocity of the particle due to its self-force. We show numerically that the singular part of the self-force has the form f_α \propto < \nabla_αρ^{-1}>, the part of \nabla_αρ^{-1} that is axisymmetric about a radial line through the particle. This differs only by a constant from its form for a Lorenz gauge. It is because we do not use a radiation gauge to describe the change in black-hole mass that the singular part of the self-force has no singularity along a radial line through the particle and, at least in this example, is spherically symmetric to subleading order in ρ.

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