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Massive Gravity.

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Summary
This summary is machine-generated.

This review explores massive gravity theories, including DGP and ghost-free models. We examine their consistency, ghost absence, and cosmological solutions, presenting related models.

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Alternative theories of gravityGeneral relativityGravityMassive gravityModified theories of gravity

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Area of Science:

  • Theoretical Physics
  • Cosmology
  • Gravitational Theories

Background:

  • Massive gravity theories offer alternatives to standard general relativity.
  • Understanding massive gravity is crucial for explaining cosmic acceleration and dark energy.
  • Recent advancements have led to new theoretical frameworks like DGP and ghost-free massive gravity.

Purpose of the Study:

  • To review recent theoretical and phenomenological progress in massive gravity.
  • To elucidate the emergence of various massive gravity models from higher-dimensional theories.
  • To assess the consistency and key features of these models, including ghost absence and cosmological implications.

Main Methods:

  • Review of theoretical frameworks, including Dvali-Gabadadze-Porrati (DGP), cascading gravity, and ghost-free massive gravity.
  • Analysis of theoretical consistency, focusing on the absence of Boulware-Deser ghosts.
  • Examination of phenomenological aspects, such as the Vainshtein mechanism and cosmological solutions.

Main Results:

  • Different massive gravity theories, including DGP, cascading, and ghost-free models, emerge from higher-dimensional general relativity.
  • The absence of Boulware-Deser ghosts has been proven for key massive gravity models.
  • The Vainshtein mechanism and cosmological solutions in these models have been reviewed.

Conclusions:

  • Massive gravity presents a viable framework with diverse theoretical models.
  • Ensuring theoretical consistency, particularly ghost absence, is critical for phenomenological applications.
  • Further exploration of alternative and related models like new massive gravity and Lorentz-violating massive gravity is ongoing.