Suppose you had three particles, one in state ψa(x), one in state ψb(x), and one in state ψc(x). Assuming ψa, ψb, and ψc are orthonormal, construct the three-particle states (analogous to Equations 5.15, 5.16, and 5.17) representing (a) distinguishable particles, (b) identical bosons, and (c) identical fermions. Keep in mind that (b) must be completely symmetric, under interchange of any pair of particles, and (c) must be completely antisymmetric, in the same sense. Comment: There’s a cute trick for constructing completely antisymmetric wave functions: Form the Slater determinant, whose first row is ψa(x1), ψb(x1), ψc(x1), etc., whose second row is ψa(x2), ψb(x2), ψc(x2), etc., and so on (this device works for any number of particles).
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