In solving different problems in string theory and also in brane theory, we consider this static gauge choice and I think that's due to the local symmetry(Repara. Inv. and Weyl) that we have in our world sheet. So, suppose I start with strings and with a general world sheet metric (and some doable ST metric). Once we use the local symmetries to make the world sheet flat, can we still use them to make the static gauge choice? How do we do it then?
Similarly for D branes we also use the static gauge choice ..right? But I guess that's just using the R.I. I don't have any problem in convincing me in this case as I don't have Weyl here so I can't use the local symmetries to make the world volume flat. Anyway, please help me out with my misunderstandings. Thanks.