Ngày tải lên :
05/03/2014, 14:20
... in the Lagrangian , and the fact that the field xµ (τ, σ) is defined on the finite strip σ π , and −∞ < τ < ∞, which has boundaries The classical equations of the motion and the boundary conditions ... Formalism Let us suppose that the Lagrangian density L depends on the field function xµ (τ, σ) and on their first and second derivatives τ2 d2 uL(xµ , xµ,i, xµ,ij ) = S= σ2 dσL(xµ, xµ,i, xµ,ij ) dτ τ1 ... ∂L + ∂i ∂xµ,1 ∂L ∂xµ,1i , (16) Bµ (τ, σ) = ∂L + ∂i ∂xµ,1 ∂L ∂xµ,1i , (16) and the following boundary conditions where and Cµ (τ, σ) = ∂l ∂xµ,11 (17) In the case of the closed string δµ (τ, σ)...