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Temperature inversion in long-range interacting systems.

Tarcísio N Teles1,2, Shamik Gupta3, Pierfrancesco Di Cintio3

  • 1Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS, Brazil.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 19, 2015
PubMed
Summary
This summary is machine-generated.

Researchers show how to create temperature inversions, where denser regions are colder, in systems with long-range interactions. This occurs when systems are perturbed from inhomogeneous thermal equilibrium, leading to unique non-equilibrium states.

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Area of Science:

  • Statistical Mechanics
  • Astrophysics
  • Plasma Physics

Background:

  • Temperature inversions, where denser regions are colder than less dense ones, are observed in natural systems like the solar corona and interstellar clouds.
  • Understanding the mechanisms behind these inversions is crucial for astrophysical and plasma physics research.

Purpose of the Study:

  • To propose a novel mechanism for spontaneously generating temperature inversions in systems with long-range interactions.
  • To investigate the role of initial conditions and interaction range in driving systems to non-equilibrium steady states.

Main Methods:

  • Developing a theoretical framework for systems prepared in inhomogeneous thermal equilibrium states.
  • Applying impulsive perturbations to these systems.
  • Utilizing a mean-field model and a two-dimensional self-gravitating system for demonstration.

Main Results:

  • Demonstrated a method to spontaneously generate temperature inversions in long-range interacting systems.
  • Showcased that unlike short-range systems, long-range systems can reach non-equilibrium stationary states with temperature inversions.
  • Highlighted the critical role of wave-particle interactions and spatial inhomogeneity in driving these states.

Conclusions:

  • The range of interparticle interactions fundamentally dictates the nature of steady states, especially out of thermal equilibrium.
  • The proposed mechanism offers a new perspective on understanding temperature inversions in diverse physical systems.
  • This work emphasizes the importance of initial conditions and interaction properties in complex system dynamics.