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  • 1
    Call number: PIK N 162-18-91347
    Type of Medium: Monograph available for loan
    Pages: XIII, 461 Seiten , Diagramme
    Edition: Reprinted
    ISBN: 9971501155 , 9971501163 , 9789971501167
    Series Statement: World scientific lecture notes in physics 9
    Language: English
    Note: Contents: Introduction ; Part 1 - Spin Glasses ; 1. The Replica Approach ; 2 The Tap Approach ; 3 Breaking the Replica Symmetry ; 4 The Nature of the Spin Glass Phase ; 5 The Cavity Method ; 6 Dynamics ; Part 2 - Optimization ; 7 Combinatorial Optimization Problems ; 8 Simulated Annealing ; 9 Analytical Results ; Part 3 - Biological Application ; 10 Introduction ; 11 Prebiotic Evolution and Spin ; 12 Brain Modelling ; 13 The Hopfield Model and its Variations
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 5158-5170 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: I present here some results on the mean field theory approach to the statistical mechanics of a D-dimensional array of Josephson junctions in the presence of a magnetic field. The mean field theory equations are obtained by computing the thermodynamical properties. In the high temperature region in the limit D→∞, where the problem is simplified, this limit defines the mean field approximation. Close to the transition point the system behaves very similar to a particular form of spin glasses, i.e., to gauge glasses. We have noticed that in this limit the evaluation of the coefficients of the high temperature expansion may be mapped onto the computation of some matrix elements for the q-deformed harmonic oscillator. The same arguments can be used to predict the thermodynamical properties in the mean field limit. These results can be extended to the low temperature phase using a conjecture on the equivalence of some system without disorder with appropriate random systems. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 433 (2005), S. 221-221 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On 30 April 1905, Einstein completed his doctoral thesis on osmotic pressure, in which he developed a statistical theory of liquid behaviour based around the existence of molecules. This work, together with his subsequent paper on ‘brownian motion’, constitutes one of the most important, but often ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 23 (1980), S. 49-82 
    ISSN: 1572-9613
    Keywords: Field theory ; second-order transitions ; critical exponents ; ε-expansion ; loop expansion ; renormalization group ; Callan-Symanzik equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We review the physical principles which are at the basis of recent field-theoretic computations of the critical exponents in two- and three-dimensional systems. We concentrate on those points that do not show up explicitly in the more standardε-expansion: they must be discussed with care if one uses a perturbative approach at fixed space dimensions (the loop expansion). We present in detail simple computations of the critical exponents, while we summarize the results of longer and more accurate computations.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 41 (1985), S. 1-16 
    ISSN: 1572-9613
    Keywords: Eden model ; DLA ; growth processes ; field theories ; mean field approximations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Continuum field theories for the Eden and DLA models are formulated, and they are shown to be related to the reggeon field theories with local and non-local interactions, respectively.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1572-9613
    Keywords: disorder ; state ; finite volume ; spin glass ; interface ; replicas ; symmetry breaking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss replica symmetry breaking (RSB) in spin glasses. We update work in this area, from both the analytical and numerical points of view. We give particular attention to the difficulties stressed by Newman and Stein concerning the problem of constructing pure states in spin glass systems. We mainly discuss what happens in finite-dimensional, realistic spin glasses. Together with a detailed review of some of the most important features, facts, data, and phenomena, we present some new theoretical ideas and numerical results. We discuss among others the basic idea of the RSB theory, correlation functions, interfaces, overlaps, pure states, random field, and the dynamical approach. We present new numerical results for the behaviors of coupled replicas and about the numerical verification of sum rules, and we review some of the available numerical results that we consider of larger importance (for example, the determination of the phase transition point, the correlation functions, the window overlaps, and the dynamical behavior of the system).
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 72 (1993), S. 857-878 
    ISSN: 1572-9613
    Keywords: Spin glasses ; equilibrium states ; replica symmetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We review some known results on the nature of the tree of states in spin glasses and we present new results on its topology. We pay particular attention to the so-called continuum limit in which the levels are labeled by a continuous variablex. We also study the dependence on the levelx of the type of branching (bifurcation, trifurcation,...). We show that the statistics of the tree is universal in the continuum limit, i.e., it does not depend on the details of the algorithm used to generate the tree.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1572-9613
    Keywords: glasses ; out-of-equilibrium dynamics ; spin glasses ; stochastic stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the response of aging systems with short-range interactions to a class of random perturbations. Although these systems are out of equilibrium, the limit value of the free energy at long times is equal to the equilibrium free energy. By exploiting this fact, we define a new order parameter function, and we relate it to the ratio between response and fluctuation, which is in principle measurable in an aging experiment. For a class of systems possessing stochastic stability, we show that this new order parameter function is intimately related to the static order parameter function, describing the distribution of overlaps between clustering states. The same method is applied to investigate the geometrical organization of pure states. We show that the ultrametric organization in the dynamics implies static ultrametricity, and we relate these properties to static separability, i.e., the property that the measure of the overlap between pure states is essentially unique. Our results, especially relevant for spin glasses, pave the way to an experimental determination of the order parameter function.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 2019-06-24
    Description: We present a mechanism for the anomalous behavior of the specific heat in low-temperature amorphous solids. The analytic solution of a mean-field model belonging to the same universality class as high-dimensional glasses, the spherical perceptron, suggests that there exists a cross-over temperature above which the specific heat scales linearly with temperature, while below it, a cubic scaling is displayed. This relies on two crucial features of the phase diagram: (i) the marginal stability of the free-energy landscape, which induces a gapless phase responsible for the emergence of a power-law scaling; and (ii) the vicinity of the classical jamming critical point, as the cross-over temperature gets lowered when approaching it. This scenario arises from a direct study of the thermodynamics of the system in the quantum regime, where we show that, contrary to crystals, the Debye approximation does not hold.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 10
    Publication Date: 2014-10-06
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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