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Unscreening Modified Gravity in the Matter Power Spectrum.

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Modified gravity theories require screening in dense regions. By analyzing the matter power spectrum and excluding high-density areas, scientists can better test these cosmic acceleration models and constrain modified gravity theories like chameleon gravity.

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Area of Science:

  • Cosmology
  • Theoretical Physics
  • Astrophysics

Background:

  • Modified gravity theories attempt to explain cosmic acceleration but require screening mechanisms in dense regions like the Solar System.
  • Screening mechanisms can limit the cosmological constraints on these modified gravity models.

Purpose of the Study:

  • To develop a method for discriminating modified gravity models from the standard cosmological model by analyzing the matter power spectrum.
  • To improve constraints on modified gravity theories by accounting for screening effects.

Main Methods:

  • Analyzing the matter power spectrum by suppressing contributions from screened high-density regions.
  • Employing N-body simulations for f(R) models and the halo model for chameleon theories.
  • Investigating the applicability of the method to the Vainshtein mechanism.

Main Results:

  • Suppressing high-density contributions allows for better discrimination of modified gravity models.
  • A percent-level measurement of clipped power can provide stringent constraints on chameleon models.
  • The method is effective for both chameleon gravity and the Vainshtein mechanism.

Conclusions:

  • Excluding screened regions from the matter power spectrum analysis enhances the ability to test modified gravity.
  • This approach offers more stringent constraints than traditional Solar System tests or dwarf galaxy observations.
  • The proposed method provides a robust way to probe modified gravity theories and cosmic acceleration.