Shanina, Z.K.; Myrzakulov, Y.M.
(L.N.Gumilyov Eurasian National University, 2018)
There are three equivalent forms of action for a string in the bosonic string theory:
a first-order form (Hamiltonian formalism), a second-order form (Polyakov action), and a nonlinear
form (Nambu-Goto action). All three ...