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首页> 外文期刊>American journal of physics >Helicity conservation under Reidemeister moves
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Helicity conservation under Reidemeister moves

机译:Reidemeister动作下的螺旋度守恒

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We discuss a connection between two fields that appear to have little in common: plasma physics and mathematical knot theory. Plasma physicists are interested in studying helicity conservation in magnetic flux ropes and knot theorists commonly consider "Reidemeister moves," transformations that preserve a property called "knottedness." To study the tangling, twisting, and untwisting of magnetic flux ropes, it is helpful to know which topological transformations conserve helicity. Although the second and third types of Reidemeister moves applied to a magnetic flux rope clearly conserve the helicity of the flux rope, the first type of Reidemeister move appears to be in conflict with helicity conservation. We show that all three Reidemeister moves conserve helicity in magnetic flux ropes. (c) 2006 American Association of Physics Teachers.
机译:我们讨论了似乎没有什么共同点的两个领域之间的联系:等离子物理学和数学结理论。等离子体物理学家对研究磁通绳中的螺旋度守恒感兴趣,结理论家通常考虑“ Reidemeister运动”,这种变换保留了一种称为“结度”的特性。研究磁通量绳索的缠结,扭曲和解捻,有助于了解哪些拓扑转换可保留螺旋度。尽管第二种和第三种Reidemeister运动明显地保留了磁通量绳的螺旋度,但是第一种Reidemeister运动似乎与螺旋度守恒冲突。我们表明,所有三个Reidemeister运动在磁通量绳索中均保持螺旋度。 (c)2006年美国物理教师协会。

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