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url url url url
  2. Weltenzyklopädie
  3. انحنای نرده‌ای - ویکی‌پدیا، دانشنامهٔ آزاد
انحنای نرده‌ای - ویکی‌پدیا، دانشنامهٔ آزاد
از ویکی‌پدیا، دانشنامهٔ آزاد
(تغییرمسیر از خمش نرده‌ای)

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در نسبیت عام، انحنای نرده‌ای چگالی لاگرانژین عمل اینشتین-هیلبرت است. معادلات اویلر-لاگرانژ برای این لاگرانژین در مورد متریک متغیر معادلات میدان خلا اینشتین را تشکیل می‌دهند و متریک‌های ثابت به نام متریک اینشتین شناخته می‌شوند. خمش نرده‌ای به صورت اثر تانسور انحنای ریچی تعریف می‌شود و می‌توان آنرا به عنوان مضربی از متوسط انحناهای مقطعی در یک نقطه توصیف نمود.

منابع

ویکی‌پدیای انگلیسی

آیکون خرد

این یک مقالهٔ خرد هندسه است. می‌توانید با گسترش آن به ویکی‌پدیا کمک کنید.

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