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The third law
The third law

... Boltzmann’s formula can be used to calculate both the absolute entropies of substances, especially if they have simple structures, like a gas, and changes in entropy that accompany various changes, such as expansion and heating. ...
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On classical and quantum effects at scattering of fast charged

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Chapter 7: Conservation of Mechanical Energy in Spring Problems
Chapter 7: Conservation of Mechanical Energy in Spring Problems

... The previous example involved essentially just one particle, the car. The wall was fixed there as a device for exerting a constant force during the collision. A more complex example can be studied when two particles collide. We first make the approximation that the two particles are subjected to no ...
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Cosmic absorption of high energy particles

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98-PhysicsCompare - Workshops+SJCOE Workshop Management

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Interactions of X and *?radiations

< 1 ... 60 61 62 63 64 65 66 67 68 ... 268 >

Eigenstate thermalization hypothesis

The Eigenstate Thermalization Hypothesis (or ETH) is a set of ideas which purports to explain when and why an isolated quantum mechanical system can be accurately described using equilibrium statistical mechanics. In particular, it is devoted to understanding how systems which are initially prepared in far-from-equilibrium states can evolve in time to a state which appears to be in thermal equilibrium. The phrase ""eigenstate thermalization"" was first coined by Mark Srednicki in 1994, after similar ideas had been introduced by Josh Deutsch in 1991. The principal philosophy underlying the eigenstate thermalization hypothesis is that instead of explaining the ergodicity of a thermodynamic system through the mechanism of dynamical chaos, as is done in classical mechanics, one should instead examine the properties of matrix elements of observable quantities in individual energy eigenstates of the system.
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