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I have a problem understanding ADM formalism. In a paper I am reading (cited as arXiv:1003.2635v2 [hep-ph]) it is said that ADM metric is as below:

ds2 = −N2dt2 + hij (dxi + Nidt)(dxj + Njdt)

and from this metric is has reached to equation 11 of the article.

how can I reach to this equation (11)?

please help!