By Eric Bertin

This concise primer (based on lectures given at summer season colleges on advanced structures and on a masters measure direction in advanced structures modeling) will offer graduate scholars and newbies to the sector with the elemental wisdom of the strategies and techniques of statistical physics and its strength for program to interdisciplinary topics.

Indeed, in recent times, statistical physics has started to draw the curiosity of a wide group of researchers within the box of complicated method sciences, starting from biology to the social sciences, economics and desktop technological know-how. extra mostly, increasingly more graduate scholars and researchers think the necessity to research a few easy ideas and questions originating in different disciplines with no unavoidably having to grasp the entire corresponding technicalities and jargon. mostly talking, the targets of statistical physics will be summarized as follows: at the one hand to review structures composed of a giant variety of interacting ‘entities’, and at the different to foretell the macroscopic (or collective) habit of the approach thought of from the microscopic legislation ruling the dynamics of the person ‘entities’. those targets are, to some degree, additionally shared by means of what's these days referred to as ‘complex structures technological know-how’ and for those purposes, platforms studied within the framework of statistical physics will be regarded as one of the least difficult examples of complicated systems—allowing additionally a slightly good built mathematical remedy.

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**Additional info for A Concise Introduction to the Statistical Physics of Complex Systems**

**Sample text**

148) −∞ From now on, we will work mainly with discrete configurations as far as formal and generic calculations are concerned, keeping in mind that the continuous variable case can be obtained by switching from discrete to continuous notations. An interesting property of continuous time master equations is the notion of detailed balance, which is related to the steady-state (or time-independent) solution of the master equation. From Eq. 147, a time-independent solution P(C) satisfies, for all configurations C [−W (C |C)P(C) + W (C|C )P(C )] = 0.

1, in the simplest case of Markov processes. The example of the random evolution of a single degree of freedom in a noisy environment (diffusive motion), leading to the Langevin and Fokker–Planck equations, is discussed in Sect. 2. In addition, there exists situations in which this random evolution can be much faster or much slower than a priori expected, leading to anomalous diffusion. It may also happen that some systems fail to reach an equilibrium state, and thus keep relaxing for a very long time, as in the case of glasses.

91) One can then distinguish two different cases: • If T ≥ Tc ≡ J, f(m) has only one minimum, for m = 0. • If T < Tc , f(m) has two symmetric minima ±m 0 . These minima are obtained as solutions of d f /dm = 0: J df = 1− dm T 1 J 1 m + m 3 = 0. 92) The non-zero solutions are m = ±m 0 with m0 = 3 √ Tc − T J −1 = 3 T T 1/2 . 93) It can be checked easily that the solution m = 0 corresponds in this case to a local maximum of f(m), and thus to a local minimum of P(m). Hence, there is a phase transition at T = Tc ≡ J , Tc being called the critical temperature.