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重力磁性 - Wikipedia

重力磁性

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重力磁性(gravitomagnetismgravitoelectromagnetism, GEM)與電磁學中的磁性並無直接關聯,它指得是重力(引力, gravity)的相伴場。這個稱呼來自於其與電磁學的類比性:旋轉的電荷除了原先即有的電場外,還會產生磁場;當質量旋轉時,除了原先即有的重力場外,還會出現重力磁場。這是廣義相對論中自然而然的預測,其中最簡單形式的重力磁性效應常被稱為參考系拖曳效應(frame dragging effects)。

[编辑] 數學形式

類似麥克斯韋方程組\mathbf{E}用以表示重力場\mathbf{B}即為重力磁場G\,重力常數,c是真空中光速\rho\,\mathbf{J}分別為質量密度(純量)與質流密度(向量):

 \nabla \cdot \mathbf{E} = -4 \pi G \rho \
 \nabla \cdot \left( \frac{1}{2} \mathbf{B} \right) = 0 \
 \nabla \times \mathbf{E} = -\frac{1}{c} \frac{\partial \left( \frac{1}{2} \mathbf{B} \right)} {\partial t} \
 \nabla \times \left( \frac{1}{2} \mathbf{B} \right) = \frac{1}{c} \left( -4 \pi G \mathbf{J} + \frac{\partial \mathbf{E}} {\partial t} \right) = \frac{1}{c} \left( -4 \pi G \rho \mathbf{v}_{\rho} + \frac{\partial \mathbf{E}} {\partial t} \right) \

[编辑] 參考文獻


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