[問題] quantum fields in curved space的公式
唸quantum fields in curved space這本書時 有個公式推導不出來...想了很久...
還問了老師 老師也有提示 但拼命算了 還是搞不出來....就不敢再問了..QQ
其實嚴格說起來應該算是數學問題
擷取本書的16頁 第2.4節Vacuum energy divergence 公式(2.39) 共有n-1維的k要積分
∞ n-1 n-1 1 ∞ 2 2 (1/2) n-2
∫ ω d k = 2 (√π) ─────── ∫ [ k + m ] k d k
-∞ Γ[ (n-1)/2 ] 0
2 n-1 2 1/2 2 2 1/2
其中 ω = [ m + Σ k ] ≡ [ m + k ]
i i
老師說要用高斯多維積分
就是利用以下
∞ 2 2 2 2
∫ exp(-x ) dx = √π ( 就是跟 r = x + y 有關的算法 )
-∞
n
改成多維積分 譬如一個n維的體積分 dV 去替換 d k
n-1
dV = r dr dΩ (Ω 類似 n-1維的立體角 )
老師說的替換我會 老師也說 其實 ω 根本沒有動
但換完之後呢?? @@
查書後 我所知的變換 裡面都有 exp
但這裡沒有阿....我到現在還是卡住...麻煩各位指點一下QQ
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※ 編輯: boyzone66 來自: 180.176.45.78 (03/16 20:28)
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