Comment on “Elastic constants from microscopic strain fluctuations”

Comment on "Elastic constants from microscopic strain fluctuations".

Sengupta [Phys. Rev. E 61, 1072 (2000)] presented an elegant and simple finite-size scaling method for the calculation of elastic constants and their corresponding correlation lengths, which is suitable for many finite discrete systems considered through simulations or experiments. We take into account a mathematical finite-size effect that was neglected by the authors in order to propose a mor...

Elastic constants from microscopic strain fluctuations

Fluctuations of the instantaneous local Lagrangian strain epsilon(ij)(r,t), measured with respect to a static "reference" lattice, are used to obtain accurate estimates of the elastic constants of model solids from atomistic computer simulations. The measured strains are systematically coarse-grained by averaging them within subsystems (of size L(b)) of a system (of total size L) in the canonic...

Calculation of Elastic Bond Constants in Atomistic Strain Analysis

Strain analysis has significance both for tailoring material properties and designing nanoscale devices. In particular, strain plays a vital role in engineering the growth thermodynamics and kinetics and is applicable for designing optoelectronic devices. In this paper, we present a methodology for establishing the relationship between elastic bond constants and measurable parameters, i.e., Poi...

Comment on "Brillouin-scattering study of the elastic constants of phenothiazine through the phase transition"

Comment on the Variation of Fundamental Constants

It is argued by Duff that only the time variation of dimensionless constants of nature is a legitimate subject of enquiry, and that dimensional constants such as c, h̄,G... are merely human constructs whose value has no operational meaning. We refute this claim and point out that such varying dimensional “constants” can have significant physical consequences for the universe that can be directly...