Open Conference Systems, StatPhys 27 Main Conference

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Residual entropies and waterlike anomalies
Marco Aurélio Alves Barbosa, Eduardo Rizzatti, Maria Farias, Marcia Barbosa

##manager.scheduler.building##: Edificio Santa Maria
##manager.scheduler.room##: Auditorio San Agustin
Date: 2019-07-08 11:45 AM – 03:30 PM
Last modified: 2019-06-15

Abstract


We propose that residual entropies can act as a source for waterlike anomalies in certain lattice models of fluids, based on theoretical investigations of different lattice models of fluids. Our results connects ground state phase transitions, residual entropies and waterlike behavior in the same theoretical framework. In particular, density was found to increase as a function of temperature, at fixed pressure, for the following lattice models of fluids:

 

-A class of one dimensional lattice fluid molecules with arbitrary short range pair interactions;

 

-A minimalist compressible cell model;

 

- Triangular lattice gas model with three body interactions.

This proposition was extended by theoretically investigating waterlike behavior on cold quantum gases, such as optical traps of Rubidium-87 on the cubic lattice, with parameters compatible with previously realized experimental setups. Density anomalies were observed on both normal and superfluid regimes: while anomalies on the normal fluid anomalies can be explained in or investigations through ‘classical’ residual entropies, the equivalent superfluid anomalies does not, deserving further studies.