Beyond the small-angle approximation for MBR anisotropy from seeds.
Beyond the small-angle approximation for MBR anisotropy from seeds.
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超越种子 MBR 各向异性的小角度近似。
DOI：
10.1103/physrevd.51.1465
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
S. Veeraraghavan
中科院分区：
文献类型：
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作者：
Albert Stebbins;S. Veeraraghavan
本文给出了在渐近平坦时空中，在弱场极限下计算的无质量粒子通过任意物质分布的引力场时能量移动的一般表达式。人们并不认为物质是非相对论性的。我们证明了令人惊讶的结果，如果该物质是由一个均匀的亮度背景，在时空中的一个给定的点观察到的亮度模式（模依赖于观察者的速度）只取决于观察者的过去光锥上的物质分布。这些结果直接适用于宇宙学MBR各向异性图案产生的对象，如宇宙弦或全球纹理附近。我们将这些结果应用于宇宙弦，找到一个修正以前发表的结果在小角度近似。我们还得到了一个塌陷纹理结的全天空各向异性模式。
In this paper we give a general expression for the energy shift of massless particles traveling through the gravitational field of an arbitrary matter distribution as calculated in the weak field limit in an asymptotically flat space-time. It is [ital not] assumed that matter is nonrelativistic. We demonstrate the surprising result that if the matter is illuminated by a uniform brightness background that the brightness pattern observed at a given point in space-time (modulo a term dependent on the observer's velocity) depends only on the matter distribution on the observer's past light cone. These results apply directly to the cosmological MBR anisotropy pattern generated in the immediate vicinity of an object such as a cosmic string or global texture. We apply these results to cosmic strings, finding a correction to previously published results in the small-angle approximation. We also derive the full-sky anisotropy pattern of a collapsing texture knot.