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I read some books about high energy physics and string theory and I saw the following formula is used very frequently
I am not good at mathematics.
So can any one help me derive this formula?
See Brown, Quantum Field Theory.
Rewrite this as lndetγ=trlnγ. Then, we can switch to an eigenbasis of the matrix γ and
lndetγ=∑ilnλi
where λi are the eigenvalues of γ. Since the eigenvalues of lnγ are lnλi we have
∑ilnλi=trlnγ
and thus
lndetγ=trlnγ.
Thanks a lot @trof
γ may not have an eigenbasis. However, the result can still be seen as true by writing γ=PJP−1, where J is the Jordan normal form of γ.
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