Jesper Jacobsen, Stephane Ouvry, Vincent Pasquier, Didina's Exact Methods in Low-dimensional Statistical Physics and PDF

By Jesper Jacobsen, Stephane Ouvry, Vincent Pasquier, Didina Serban, Leticia Cugliandolo

ISBN-10: 0191574449

ISBN-13: 9780191574443

ISBN-10: 0199574618

ISBN-13: 9780199574612

Contemporary years have proven vital and excellent convergences among ideas regularly utilized in theoretical physics and strategies rising from sleek arithmetic (combinatorics, chance thought, topology, algebraic geometry, etc). those strategies, and specifically these of low-dimensional statistical types, are instrumental in enhancing our realizing of rising fields, similar to quantum computing and cryptography, complicated structures, and quantum fluids. This publication units those matters right into a better and extra coherent theoretical context than is at the moment to be had. for example, knowing the main recommendations of quantum entanglement (a degree of data density) necessitates an intensive wisdom of quantum and topological box conception, and integrable versions. to accomplish this objective, the lectures got through foreign leaders within the fields of precisely solvable types in low dimensional condensed subject and statistical physics.

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Additional resources for Exact Methods in Low-dimensional Statistical Physics and Quantum Computing: Lecture Notes of the Les Houches Summer School: Volume 89, July 2008

Example text

75) where s ≡ s−k/2. What happens for overscreening? ” To proceed, we show how to calculate Simp (0) from the boundary state. All calculations are done in the scaling limit, ignoring irrelevant operators, so that Simp (T ) is a constant, independent of T , and characterizes the particular boundary condition. e. we are interested in the limit l/β → ∞. Thus it is convenient to use the following expression for the partition function (see Cardy’s chapter in this book and Cardy (1989)) ZAB : A|a0 a0|B χa (e−4πl/β ) → eπlc/6β A|00 00|B .

One can obtain the complete set of boundary states from a reference state by a process of fusion with primary operators. 11). We then obtain the CIBC corresponding to the low-energy fixed point by fusion with an appropriate primary operator. 66). e. the lowest-energy state) (Knizhnik and Zamolodchikov 1984, Gepner and Witten 1986, Di Francesco et al. 1997). There is one conformal tower for each spin j with j = 0, 1/2, 1, . . , k/2 . 68) These primary fields have zero conformal spin and left and right scaling dimensions: Δ= j(j + 1) .

Furthermore, g √ is not, in general, an integer. For instance, for k = 2 and s = 1/2, g = 2. Thus we may say that there is a noninteger “ground state degeneracy”. Note that in all cases the ground state degeneracy is reduced under renormalization from the zero-Kondo-coupling fixed point to the infrared stable fixed point. This is a special case of a general result: the ground state degeneracy always decreases under renormalization. This is related to Zamolodchikov’s c-theorem (Zamolodchikov 1986), which states that the conformal anomaly parameter, c, always decreases under renormalization.

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Exact Methods in Low-dimensional Statistical Physics and Quantum Computing: Lecture Notes of the Les Houches Summer School: Volume 89, July 2008 by Jesper Jacobsen, Stephane Ouvry, Vincent Pasquier, Didina Serban, Leticia Cugliandolo


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