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Radion-induced brane preheating.

Hael Collins1, R Holman, Matthew R Martin

  • 1Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA. hael@cmuhep2.phys.cmu.edu

Physical Review Letters
|July 15, 2003
PubMed
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Stabilizing the interbrane separation in Randall-Sundrum models generates a radion potential. Its early universe oscillations cause exponential particle growth via parametric amplification, similar to inflationary preheating.

Area of Science:

  • High-energy physics
  • Cosmology
  • String theory

Background:

  • The Randall-Sundrum model addresses the hierarchy problem by introducing extra spatial dimensions.
  • Stabilizing the interbrane separation is crucial for realistic model building.
  • The Goldberger-Wise mechanism provides a way to stabilize this separation.

Purpose of the Study:

  • To investigate the cosmological implications of a stabilized Randall-Sundrum model.
  • To explore the generation of particles from radion oscillations in the early universe.
  • To analyze the conditions for parametric amplification of brane particles.

Main Methods:

  • Theoretical analysis of the radion potential in stabilized Randall-Sundrum models.
  • Investigating coherent oscillations of the radion field.

Related Experiment Videos

  • Applying the concept of parametric amplification to brane-localized fields.
  • Comparing the process to preheating in inflationary cosmology.

    • Main Results:

    • A potential for the radion field is generated when interbrane separation is stabilized.
    • Coherent radion oscillations lead to exponential growth of brane particles.
    • Conditions for this exponential growth, analogous to preheating, are identified.
    • The phenomenon is demonstrated for a scalar field confined to a brane.

    Conclusions:

    • Stabilized Randall-Sundrum models with Goldberger-Wise mechanism can lead to significant particle production in the early universe.
    • Radion oscillations provide a novel mechanism for preheating-like phenomena.
    • The findings have implications for understanding particle generation and cosmology in extra-dimensional models.