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NEWS

Daan Frenkel

Department of Chemistry University of Cambridge

Friday, September 23rd, 2016 at 11:30:00 AM

Aula Querzoli - LENS

Enrico Fermi Colloquium

Published on-line at 11:16:32 AM on Wednesday, September 14th, 2016

Counting the uncountable

In my talk I will describe how granular entropies of much larger systems can now be computed, using a novel algorithm. Interestingly, it turns out the definitio

In an attempt to construct a Statical Mechanics of Powders,  Sam Edwards introduced the concept of `granular entropy', defined as the logarithm of the number of distinct packings of N granular particles in a fixed volume V.

In 1989, the proposal was rather controversial but much of the debate was sterile because the granular entropy could not even be computed  for systems as small as 20 particles - hardly a good approximation of the thermodynamic limit.

In my talk I will describe how granular entropies of much larger systems can now be computed, using a novel algorithm. Interestingly, it turns out the definition of granular  entropy will have to be modified to guarantee that granular entropy is extensive.

Which brings us back to the Gibbs paradox and a dirty secret of colloid science.

For further informations, please contact Diederik Wiersma.