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E-International Scientific Research JournalISSN: 2094-1749 Volume: 2 Issue: 4, 2010which is <strong>the</strong> minimum of <strong>the</strong> standard FH free energy. Now, insert <strong>the</strong> decomposition (11) in<strong>the</strong> total Hamiltonian, relations (1a) and (2), and expand it to second order around , togetWith <strong>the</strong> new bulk Hamiltonianwhich is quadratic in <strong>the</strong> field . The parameters and areExplicitly, we havew<strong>here</strong> c and µ are those surface parameters defined in Eq. (10). The signs (+) and (-) are forhigh and low temperatures, respectively.The following step consists in <strong>the</strong> computation of <strong>the</strong> induced force away from <strong>the</strong>critical point. To this end, use will be made of <strong>the</strong> new Hamiltonian, relations (12) and (13).322