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Palatini form of 1/R gravity.

Eanna E Flanagan1

  • 1Newman Laboratory, Cornell University, Ithaca, NY 14853-5001, USA.

Physical Review Letters
|March 5, 2004
PubMed
Summary
This summary is machine-generated.

A modified gravity theory proposed for cosmic acceleration, while initially promising, is invalidated by particle physics interactions. This scalar-tensor theory creates new forces, contradicting experimental results like electron-electron scattering.

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Area of Science:

  • Cosmology
  • Theoretical Physics
  • Gravitational Theory

Background:

  • The universe's accelerated expansion is a major cosmological puzzle.
  • Scalar-tensor theories offer alternative explanations for cosmic acceleration.
  • A modified Palatini gravity theory, dependent on the Ricci scalar, has been proposed.

Purpose of the Study:

  • To investigate the viability of a modified Palatini gravitational theory as a model for cosmic acceleration.
  • To determine the theoretical implications of this theory for particle physics.
  • To assess whether the theory aligns with existing observational and experimental data.

Main Methods:

  • The study analyzes the mathematical equivalence of the modified Palatini theory to a specific scalar-tensor theory.

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  • It involves integrating out the scalar field from the action.
  • The research examines the resulting interactions among standard model particles at relevant energy scales.

    • Main Results:

    • The modified Palatini theory is shown to be equivalent to a scalar-tensor theory lacking a scalar field kinetic energy term.
    • Integrating out the scalar field introduces new interactions between standard model matter fields.
    • These interactions occur at an energy scale of approximately 10(-3) eV.

    Conclusions:

    • The scalar-tensor equivalence implies new, unobserved particle interactions.
    • These predicted interactions are constrained by existing experimental data, such as electron-electron scattering.
    • Therefore, the modified Palatini theory, as formulated, is excluded by current experimental evidence.