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Axon Stretch Growth: The Mechanotransduction of Neuronal Growth
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Hierarchical axion inflation.

Ido Ben-Dayan1, Francisco Gil Pedro1, Alexander Westphal1

  • 1Deutsches Elektronen-Synchrotron DESY, Theory Group, D-22603 Hamburg, Germany.

Physical Review Letters
|January 24, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a new field theory mechanism for cosmic inflation using two axions. It demonstrates how sub-Planckian decay constants can generate effective trans-Planckian values, keeping inflation within a sub-Planckian domain.

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Area of Science:

  • Cosmology
  • Theoretical Physics
  • String Theory

Background:

  • Cosmic inflation is a key theory explaining the early universe's expansion.
  • Generating large-scale structures requires specific inflationary models.
  • Trans-Planckian effects in inflation pose theoretical challenges.

Purpose of the Study:

  • To propose a novel field theory mechanism for cosmic inflation.
  • To demonstrate the generation of effective trans-Planckian decay constants from sub-Planckian ones.
  • To explore inflation within a sub-Planckian domain with minimal tuning.

Main Methods:

  • Utilizing a minimal two-axion system.
  • Implementing a hierarchy between axion decay constants.
  • Employing nonperturbative effects for inflation.

Main Results:

  • Successfully generated an effective trans-Planckian decay constant from sub-Planckian values.
  • Achieved inflation through nonperturbative effects with minimal tuning.
  • Kept the inflationary motion entirely within a sub-Planckian domain.

Conclusions:

  • The proposed two-axion model offers a viable mechanism for sub-Planckian inflation.
  • This approach addresses challenges associated with trans-Planckian physics in cosmology.
  • Embedding the model within string theory setups is a promising future direction.