1,564 research outputs found
Statistical thermodynamic basis in drug-receptor interactions: double annihilation and double decoupling alchemical theories, revisited
Alchemical theory is emerging as a promising tool in the context of molecular
dynamics simulations for drug discovery projects. In this theoretical
contribution, I revisit the statistical mechanics foundation of non covalent
interactions in drug-receptor systems, providing a unifying treatment that
encompasses the most important variants in the alchemical approaches, from the
seminal Double Annihilation Method by Jorgensen and Ravimohan [W.L. Jorgensen
and C. Ravimohan, J. Chem. Phys. 83,3050, 1985], to the Gilson's Double
Decoupling Method [M. K. Gilson and J. A. Given and B. L. Bush and J. A.
McCammon, Biophys. J. 72, 1047 1997] and the Deng and Roux alchemical theory
[Y. Deng and B. Roux, J. Chem. Theory Comput., 2, 1255 2006]. Connections and
differences between the various alchemical approaches are highlighted and
discussed, and finally placed into the broader context of nonequilibrium
thermodynamics.Comment: 25 pages, 4 figure
Convergent expansions for Random Cluster Model with q>0 on infinite graphs
In this paper we extend our previous results on the connectivity functions
and pressure of the Random Cluster Model in the highly subcritical phase and in
the highly supercritical phase, originally proved only on the cubic lattice
, to a much wider class of infinite graphs. In particular, concerning the
subcritical regime, we show that the connectivity functions are analytic and
decay exponentially in any bounded degree graph. In the supercritical phase, we
are able to prove the analyticity of finite connectivity functions in a smaller
class of graphs, namely, bounded degree graphs with the so called minimal
cut-set property and satisfying a (very mild) isoperimetric inequality. On the
other hand we show that the large distances decay of finite connectivity in the
supercritical regime can be polynomially slow depending on the topological
structure of the graph. Analogous analyticity results are obtained for the
pressure of the Random Cluster Model on an infinite graph, but with the further
assumptions of amenability and quasi-transitivity of the graph.Comment: In this new version the introduction has been revised, some
references have been added, and many typos have been corrected. 37 pages, to
appear in Communications on Pure and Applied Analysi
The analyticity region of the hard sphere gas. Improved bounds
We find an improved estimate of the radius of analyticity of the pressure of
the hard-sphere gas in dimensions. The estimates are determined by the
volume of multidimensional regions that can be numerically computed. For ,
for instance, our estimate is about 40% larger than the classical one.Comment: 4 pages, to appear in Journal of Statistical Physic
On Lennard-Jones type potentials and hard-core potentials with an attractive tail
We revisit an old tree graph formula, namely the Brydges-Federbush tree
identity, and use it to get new bounds for the convergence radius of the Mayer
series for gases of continuous particles interacting via non absolutely
summable pair potentials with an attractive tail including Lennard-Jones type
pair potentials
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