Darwin–Fowler method

E150831

The Darwin–Fowler method is a statistical mechanics technique that uses complex analysis and generating functions to derive distribution laws for systems of many particles.

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Darwin–Fowler method canonical 1

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Predicate Object
instanceOf mathematical method
statistical mechanics method
appliesTo systems of many particles
approach statistical treatment of classical systems
statistical treatment of quantum systems
assumes large number of particles
thermodynamic limit
basedOn contour integration in the complex plane
characteristic systematic derivation of distribution functions
use of complex contour integrals for counting states
derives occupation number distributions
thermodynamic quantities from partition functions
developedBy Charles Galton Darwin
Ralph Fowler
surface form: Ralph Howard Fowler
field statistical mechanics
goal obtain equilibrium distribution of particles over energy levels
historicalPeriod early 20th century
involves evaluation of residues in the complex plane
expansion of generating functions
mathematicalTool asymptotic analysis
generating function of occupation numbers
saddle-point approximation
purpose derive distribution laws for systems of many particles
relatedTo Laplace transform methods in statistical mechanics
canonical ensemble
combinatorial methods in statistical mechanics
ensemble theory
grand canonical ensemble
method of steepest descents
microcanonical ensemble
partition function
probability generating functions
usedFor counting microstates consistent with macroscopic constraints
deriving Bose–Einstein statistics
deriving Fermi–Dirac statistics
deriving Maxwell–Boltzmann statistics
linking microscopic states to macroscopic thermodynamic behavior
usedIn classical statistics
quantum statistics
theoretical physics
uses complex analysis
generating functions

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Charles Galton Darwin notableWork Darwin–Fowler method