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Updated: Feb 22, 2026

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Gravitational Wave Oscillations in Bigravity.

Kevin Max1, Moritz Platscher2, Juri Smirnov3

  • 1Scuola Normale Superiore and INFN Pisa, Piazza dei Cavalieri, 7-56126 Pisa, Italy.

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|September 27, 2017
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Gravitational wave oscillations are derived in bigravity, analogous to neutrino oscillations. This research presents new limits on the graviton parameter space in bigravity.

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Area of Science:

  • Theoretical Physics
  • Cosmology
  • Gravitational Wave Astronomy

Background:

  • General relativity describes gravity with a single metric tensor.
  • Bigravity theories introduce a second dynamical tensor field, potentially modifying gravitational wave behavior.

Purpose of the Study:

  • To derive consistent equations for gravitational wave oscillations in bigravity.
  • To explore the phenomenological implications of these oscillations.
  • To establish new constraints on the graviton parameter space within bigravity.

Main Methods:

  • Derivation of consistent equations for gravitational wave propagation in a bigravity framework.
  • Analysis of the coupling between two tensor fields, leading to massless and massive combinations.
  • Comparison of the propagation basis with the production/detection basis for gravitational waves.

Main Results:

  • Explicit derivation of oscillatory behavior for gravitational waves in bigravity.
  • Identification of a difference between the physical metric coupling to matter and the wave propagation metric.
  • Presentation of novel limits on the graviton parameter space in bigravity.

Conclusions:

  • Gravitational wave oscillations are a predicted phenomenon in bigravity, analogous to neutrino oscillations.
  • The distinct bases for wave production/detection and propagation are key to observing these oscillations.
  • The study provides new, stringent constraints for bigravity theories.