Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-01-25
Physics
Condensed Matter
Statistical Mechanics
Extended version of the invited talk given at the Sixteenth National Symposium on Radiation Physics, Meenakshi College for Wom
Scientific paper
Ludwig Boltzmann had a hunch that irreversibility exhibited by a macroscopic system arises from the reversible dynamics of its microscopic constituents. He derived a nonlinear integro-differential equation - now called the Boltzmann equation - for the phase space density of the molecules of a dilute fluid. He showed that the Second law of thermodynamics emerges from Newton's equations of motion. However Boltzmann realized that stosszahlansatz, employed in the derivation, smuggles in an element of stochasticity into the transport equation. He then proposed a fully stochastic description of entropy which laid the foundation for statistical mechanics. Recent developments, embodied in different fluctuation theorems, have shown that Boltzmann's hunch was, in essence, correct.
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