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Acausality of massive gravity.

S Deser1, A Waldron2

  • 1Lauritsen Laboratory, Caltech, Pasadena, California 91125, USA and Physics Department, Brandeis University, Waltham, Massachusetts 02454, USA.

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Summary
This summary is machine-generated.

The ghost-free Wess-Zumino massive gravity model allows faster-than-light waves, making it acausal. This issue stems from the constraint intended to eliminate unwanted ghost modes.

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Area of Science:

  • Theoretical Physics
  • Gravitational Theory

Background:

  • Wess-Zumino massive gravity models are studied for their properties.
  • Removing ghost modes is crucial for theoretical consistency.

Purpose of the Study:

  • Analyze the ghost-free, 5-degree of freedom Wess-Zumino massive gravity model.
  • Investigate potential pathologies like acausality.

Main Methods:

  • Characteristic analysis of the Wess-Zumino massive gravity model.
  • Examination of shock wave solutions.

Main Results:

  • The model admits superluminal shock wave solutions.
  • The model is shown to be acausal.

Conclusions:

  • The constraint removing the Boulware-Deser ghost mode paradoxically leads to acausality.
  • Ghost-free massive gravity models may still exhibit pathologies.