9783642070532 - The Flow Equation Approach to Many-Particle Systems (Springer Tracts in Modern Physics, Band 217) von Kehrein, Stefan (4 Ergebnisse)

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Taschenbuch. Zustand: Neu. The Flow Equation Approach to Many-Particle Systems | Stefan Kehrein | Taschenbuch | Springer Tracts in Modern Physics | xii | Englisch | 2010 | Springer | EAN 9783642070532 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu.

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Overthepastdecade,the owequationmethodhasdevelopedintoanewv- satile theoretical approach to quantum many-body physics. Its basic concept was conceived independently by Wegner [1] and by G lazek and Wilson [2, 3]: the derivation of a unitary ow that makes a many-particle Hamiltonian - creasingly energy-diagonal. This concept can be seen as a generalization of theconventionalscalingapproachesinmany-bodyphysics,wheresomeult- violet energy scale is lowered down to the experimentally relevant low-energy scale [4]. The main di erence between the conventional scaling approach and the ow equation approach can then be traced back to the fact that the ow equation approach retains all degrees of freedom, i. e. the full Hilbert space, while the conventional scaling approach focusses on some low-energy subspace. One useful feature of the ow equation approach is therefore that it allows the calculation of dynamical quantities on all energy scales in one uni ed framework. Since its introduction, a substantial body of work using the ow eq- tion approach has accumulated. It was used to study a number of very d- ferent quantum many-body problems from dissipative quantum systems to correlated electron physics. Recently, it also became apparent that the ow equation approach is very suitable for studying quantum many-body n- equilibrium problems, which form one of the current frontiers of modern theoretical physics. Therefore the time seems ready to compile the research literature on ow equations in a consistent and accessible way, which was my goal in writing this book.

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