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Updated: Oct 20, 2025

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Linear response in the uniformly heated granular gas
Bernardo Sánchez-Rey1, Antonio Prados2
1Departamento de Física Aplicada I, E.P.S., Universidad de Sevilla, Virgen de África 7, E-41011 Sevilla, Spain.
We studied how granular gases respond to changes in driving intensity. Our findings explain anomalous behavior in these systems, offering insights into their complex dynamics.
Area of Science:
- Physics
- Nonlinear Dynamics
- Statistical Mechanics
Background:
- Granular gases are driven systems far from equilibrium.
- Understanding their response properties is crucial for predicting their behavior.
Purpose of the Study:
- Analyze linear response properties of uniformly heated granular gases.
- Investigate direct relaxation and anomalous Kovacs response.
Main Methods:
- Linearizing evolution equations around the steady state.
- Deriving generalized out-of-equilibrium fluctuation-dissipation relations.
- Comparing analytical results with numerical simulations.
Main Results:
- Characterized direct relaxation after driving intensity jumps.
- Explained anomalous Kovacs response by a sign change in the second relaxation mode.
- Found good agreement between analytical and numerical results.
Conclusions:
- The study provides a framework for understanding granular gas dynamics.
- Identified key properties governing anomalous responses.
- Validated analytical methods with numerical simulations.
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