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Related Experiment Videos

Dynamical casimir effect in braneworlds.

Ruth Durrer1, Marcus Ruser

  • 1Département de Physique Théorique, Université de Genève, 24 quai Ernest Ansermet, CH-1211 Genève 4, Switzerland. ruth.durrer@physics.unige.ch

Physical Review Letters
|October 13, 2007
PubMed
Summary
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In warped braneworld cosmology, Kaluza-Klein particles cannot be dark matter due to their scaling. Graviton production from bouncing branes in anti-de Sitter space suggests back reactions are significant for realistic scenarios.

Area of Science:

  • Cosmology
  • String Theory
  • High-Energy Physics

Background:

  • Braneworld cosmology models the universe as a brane in higher dimensions.
  • Moving branes can generate gravitons from vacuum fluctuations, analogous to a moving mirror producing photons.
  • Kaluza-Klein (KK) particles are theoretical particles arising in higher-dimensional theories.

Purpose of the Study:

  • To investigate the viability of Kaluza-Klein particles as dark matter in warped braneworld scenarios.
  • To analyze graviton production from bouncing branes in five-dimensional anti-de Sitter space.
  • To assess the impact of graviton back-reaction on cosmological models.

Main Methods:

  • Analytical investigation of Kaluza-Klein particle scaling with cosmic expansion.

Related Experiment Videos

  • Numerical simulations of graviton production for bouncing branes.
  • Analysis of back-reaction effects from generated gravitons.

    • Main Results:

    • Kaluza-Klein particles generically scale like stiff matter, precluding them from being dark matter in warped braneworlds.
    • Significant production of massless and KK gravitons is found for bouncing branes.
    • The back-reaction of generated gravitons is likely relevant for realistic cosmological bounces.

    Conclusions:

    • Warped braneworld models face challenges in explaining dark matter with Kaluza-Klein particles.
    • Graviton production and back-reaction are crucial considerations for bouncing brane models.
    • Further research is needed to reconcile braneworld cosmology with observational data.