[gmx-users] potential energy of a system
jalemkul at vt.edu
Wed Mar 29 15:04:08 CEST 2017
On 3/29/17 8:43 AM, Mark Abraham wrote:
> The total potential energy has everything by definition, so I don't know
> what you're asking.
> Additivity of the components of the potential energy is an artefact of the
> construction of the model physics. While it is true that different physical
> phenomena underlie some of the components, the parameterization of the
> force field did not target meaningful decomposition of the potential
> energy. But you might be able to benefit from fortuitous cancellation
> effects when comparing such things.
Nitpick here: in CHARMM (and our polarizable model), we seek to get a variety of
QM interaction energies explicitly correct (interactions with water, ions, other
small molecules) so indeed there is some reliability in these metrics with
CHARMM. Of course, like all force fields, there is some inherent error
cancellation but we do make an effort to get all of this kind of stuff right.
Most other force fields, of course, do not, seeking instead to get overall
properties correct, leaving the details to be debatable. We try to get it all :)
Justin A. Lemkul, Ph.D.
Ruth L. Kirschstein NRSA Postdoctoral Fellow
Department of Pharmaceutical Sciences
School of Pharmacy
Health Sciences Facility II, Room 629
University of Maryland, Baltimore
20 Penn St.
Baltimore, MD 21201
jalemkul at outerbanks.umaryland.edu | (410) 706-7441
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