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H - Spaces: Actes de la Reunion de Neuchatel (Suisse), Aout by Francois Sigrist PDF

By Francois Sigrist

ISBN-10: 3540054618

ISBN-13: 9783540054610

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Additional info for H - Spaces: Actes de la Reunion de Neuchatel (Suisse), Aout 1970

Example text

6 Consequently, the flow preserves this symmetry: [H(B), S] = 0 ∀B . 81) that does not respect the symmetry. 6 Notice that [H0 , S] = 0 holds trivially in all realistic examples. 30 2 Transformation of the Hamiltonian 3. 82) is particularly well-behaved as we have seen in the previous chapter. As a general rule I recommend working with the canonical generator since this choice is very robust. 7 Different choices of the generator amount to different ways of doing the expansion around the noninteracting model.

T. Chu, Fields Institute Communications 3, 87 (1994) 19. W. Brockett, Lin. Alg. and its Appl. 146, 79 (1991) 20. H. A. T. P. Flannery: Numerical Recipes in C, 2nd edn (Cambridge University Press, Cambridge 1992) 21. G. Wilson, Rev. Mod. Phys. 47, 773 (1975) 22. D. G. Wilson, Phys. Rev. D 57, 3558 (1998) 23. D. G. Wilson, Phys. Rev. Lett. 89, 230401 (2002); Erratum Phys. Rev. Lett. 92, 139901 (2004) 24. D. G. Wilson, Phys. Rev. B 69, 094303 (2004) 3 Evaluation of Observables The evaluation of observables in the flow equation framework is the concept that tends to be most unfamiliar by comparison with traditional many-body methods.

Rev. D 57, 3558 (1998) 23. D. G. Wilson, Phys. Rev. Lett. 89, 230401 (2002); Erratum Phys. Rev. Lett. 92, 139901 (2004) 24. D. G. Wilson, Phys. Rev. B 69, 094303 (2004) 3 Evaluation of Observables The evaluation of observables in the flow equation framework is the concept that tends to be most unfamiliar by comparison with traditional many-body methods. It introduces novel ideas that take some time getting used to, but this is well worth the effort. In fact, the flow equation approach is particularly useful for evaluating observables like correlation functions.

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H - Spaces: Actes de la Reunion de Neuchatel (Suisse), Aout 1970 by Francois Sigrist


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