221,758 research outputs found
Estimating the density scaling exponent of viscous liquids from specific heat and bulk modulus data
It was recently shown by computer simulations that a large class of liquids
exhibits strong correlations in their thermal fluctuations of virial and
potential energy [Pedersen et al., Phys. Rev. Lett. 100, 015701 (2008)]. Among
organic liquids the class of strongly correlating liquids includes van der
Waals liquids, but excludes ionic and hydrogen-bonding liquids. The present
note focuses on the density scaling of strongly correlating liquids, i.e., the
fact their relaxation time tau at different densities rho and temperatures T
collapses to a master curve according to the expression tau propto
F(rho^gamma/T) [Schroder et al., arXiv:0803.2199]. We here show how to
calculate the exponent gamma from bulk modulus and specific heat data, either
measured as functions of frequency in the metastable liquid or extrapolated
from the glass and liquid phases to a common temperature (close to the glass
transition temperature). Thus an exponent defined from the response to highly
nonlinear parameter changes may be determined from linear response
measurements
NVU perspective on simple liquids' quasiuniversality
The last half century of research into the structure, dynamics, and
thermodynamics of simple liquids has revealed a number of approximate
universalities. This paper argues that simple liquids' reduced-coordinate
constant-potential-energy hypersurfaces constitute a quasiuniversal family of
compact Riemannian manifolds parameterized by a single number, from which
follows these liquids' quasiuniversalities
On consistency of hydrodynamic approximation for chiral media
We consider chiral liquids, that is liquids consisting of massless fermions
and right-left asymmetric. In such media, one expects existence of
electromagnetic current flowing along an external magnetic field, associated
with the chiral anomaly. The current is predicted to be dissipation-free. We
consider dynamics of chiral liquids, concentrating on the issues of possible
instabilities and infrared sensitivity. Instabilities arise, generally
speaking, already in the limit of vanishing electromagnetic constant,
. In particular, liquids with non-vanishing chiral chemical
potential might decay into right-left asymmetric states containing vortices.Comment: Published versio
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