南部-后藤作用量是玻色弦理论中最简单的作用量之一。这个作用量以南部阳一朗和后藤铁男(日语:後藤鉄男/ごとうてつお Gotō Tetsuo)这两个日本物理家的名字命名。[1]
南后作用量等于世界面的面积:
若
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相对论的作用量是下面的泛函:
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最小作用量原理说经典方程说泛函导数等于0:

量子相对论用泛函积分
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设时空是d+1维的:
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(
,
)是世界面的参数。
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设
是
维时空的距离函数,则
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是世界面的距离函数。
而
。世界面的面积
是
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其中
,
。若
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
则距离函数
是
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
南后作用是[2][3]
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使用上文的距离函数
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或
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这是上文相对论作用量的二维推广。
- ^ Nambu, Yoichiro, Lectures on the Copenhagen Summer Symposium (1970), unpublished.
- ^ Zwiebach, Barton. A First Course in String Theory. Cambridge University Press. 2003. ISBN 978-0521880329.
- ^ See Chapter 19 of
Kleinert's standard textbook on Path Integrals in Quantum Mechanics, Statistics, Polymer Physics, and Financial Markets, 5th edition, World Scientific (Singapore, 2009) (页面存档备份,存于互联网档案馆) (also available online (页面存档备份,存于互联网档案馆))
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