t-expansion and the Mathieu Equation
نویسندگان
چکیده
The t-expansion, a nonperturbative analytic method for calculating the ground-state expectation values of arbitrary operators of the Hamiltonian, is applied to the Mathieu equation. Connrming previous results in other systems, a t-expansion up to order t 2 is suucient to recover the behaviour of the exact solution. A very good performance is observed when a variational wave function of the form j 0 >= exp(V (x)=2) is used in the calculation of connected moments of the Hamiltonian.
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