Nambu–Goto action S = –T ∫ d²σ √(–det h_ab) with induced worldsheet metric h_ab = ∂_aX^μ∂_bX_μ (Polyakov form introduces auxiliary worldsheet metric). Quantisation consistent only in D=26.
Nambu–Goto action S = –T ∫ d²σ √(–det h_ab) with induced worldsheet metric h_ab = ∂_aX^μ∂_bX_μ (Polyakov form introduces auxiliary worldsheet metric). Quantisation consistent only in D=26.