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Related Experiment Videos

Lorentz invariance and quantum gravity: an additional fine-tuning problem?

John Collins1, Alejandro Perez, Daniel Sudarsky

  • 1Physics Department, Pennsylvania State University, University Park, PA 16802, USA.

Physical Review Letters
|December 17, 2004
PubMed
Summary
This summary is machine-generated.

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Combining quantum field theories with gravity may cause significant Lorentz violation, challenging space-time structure at the Planck length. New estimates suggest this violation could be at the percent level, necessitating searches for mechanisms that preserve Lorentz invariance.

Area of Science:

  • Theoretical physics
  • Quantum gravity
  • Particle physics

Background:

  • Standard quantum field theories and gravity are difficult to reconcile.
  • Combining them suggests space-time breakdown at the Planck length (1.6x10^-35 m).
  • This breakdown may lead to violations of Lorentz invariance, motivating high-precision searches.

Purpose of the Study:

  • To investigate Lorentz violation arising from combining elementary particle interactions with a Planck-scale preferred frame.
  • To estimate the magnitude of potential Lorentz violation.
  • To highlight the importance of searching for theoretical mechanisms that preserve Lorentz invariance.

Main Methods:

  • Theoretical calculations combining known elementary particle interactions with a Planck-scale preferred frame.

Related Experiment Videos

  • Analysis of preferred-frame effects in quantum gravity.
  • Estimation of Lorentz violation magnitude.

    • Main Results:

    • Combining quantum field theories with gravity predicts Lorentz violation at the percent level.
    • This is approximately 20 orders of magnitude larger than previous estimates.
    • Such large violations occur unless the theory's bare parameters are extremely fine-tuned.

    Conclusions:

    • High-precision searches for Lorentz invariance violation are crucial.
    • Theoretical efforts must focus on mechanisms that naturally preserve Lorentz invariance.
    • The reconciliation of quantum mechanics and gravity has profound implications for fundamental physics.