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Defect Production in Compressed Filament Bundles.

Valentin M Slepukhin1, Alex J Levine1,2

  • 1Department of Physics and Astronomy, University of California, Los Angeles, California 90095-1596, USA.

Physical Review Letters
|October 22, 2021
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Summary
This summary is machine-generated.

Biopolymer filament bundles under compression exhibit a novel instability, generating topological defects that reduce elastic energy. This thermally activated process is analogous to the Schwinger effect in quantum physics.

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Area of Science:

  • Biophysics
  • Materials Science
  • Soft Matter Physics

Background:

  • Biopolymer filament bundles are crucial in cellular mechanics.
  • Understanding their response to compressive loading is essential.
  • Existing models often rely on traditional Euler buckling.

Purpose of the Study:

  • To investigate the mechanical instability of biopolymer filament bundles under compression.
  • To explore the role of transient cross-linkers in this instability.
  • To analyze the phenomenon of thermally activated topological defect pair production.

Main Methods:

  • Theoretical analysis of biopolymer bundle mechanics.
  • Modeling of compressive loading effects.
  • Investigation of thermally activated processes and defect dynamics.

Main Results:

  • Identified a mechanical instability occurring at stresses below Euler buckling.
  • Observed thermally activated pair production of topological defects.
  • Demonstrated that these defects (bending-kinks) shorten effective bundle length, reducing elastic energy.

Conclusions:

  • The observed instability is a thermal analog of the Schwinger effect.
  • This mechanism provides a new understanding of biopolymer bundle mechanics under compression.
  • The findings have implications for various biopolymer systems, including cytoskeletal filaments.