Theoretical Physics Colloquium
Equation of state of a model glass
by Prof. Deepak Dhar (TIFR)
Tuesday, October 5, 2010
from
to
(Asia/Kolkata)
at Colaba Campus ( AG-69 )
at Colaba Campus ( AG-69 )
Description |
Traditionally, glasses are treated as non-equilibrium states of matter, very slowly relaxing to equilibrium. However, on the time-scale of milliseconds to years, the window glass appears to be in some kind of thermal equilibrium, and it should be possible to calculate its properties theoretically, from the basic principles of statistical mechanics. The standard method of determining properties like equation of state of matter in equilibrium stat-mech using the canonical partition functions only gives the properties of crystalline quartz, and not of glass. One needs to modify the prescription, and make only a restricted sum over states. While the idea of restricted ensembles is not new, it has not been possible so far to actually calculate such restricted partition functions in any non-trivial case exactly. I will describe a simple model of interacting particles, which shows a glassy phase, and where the exact equation of state can be determined. |
Material: | |
Organised by | Dr. Vikram Tripathi |
PODCAST | click here to start |