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White Dwarf Critical Tests for Modified Gravity.

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White dwarfs offer unique insights into scalar-tensor gravity theories. These compact stars provide stronger constraints on deviations from Newtonian gravity than red or brown dwarfs.

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Area of Science:

  • Astrophysics
  • Gravitational Physics
  • Stellar Evolution

Background:

  • Scalar-tensor theories propose modifications to gravity within astrophysical objects.
  • Beyond Horndeski theories, specifically G³ type, require testing in extreme environments.

Purpose of the Study:

  • To investigate the potential of compact stars, particularly white dwarfs, in constraining scalar-tensor gravity theories.
  • To derive stringent constraints on the parameter ϒ, which quantifies deviations from Newtonian gravity.

Main Methods:

  • Analyzing the mass-radius relation of white dwarfs.
  • Utilizing the Chandrasekhar mass limit for white dwarfs.
  • Calculating the maximal rotational frequency of white dwarfs.

Main Results:

  • White dwarfs provide stringent and independent constraints on the parameter ϒ.
  • The constraints derived from white dwarfs are more significant than those from red and brown dwarfs.
  • The study successfully tests beyond Horndeski G³ type theories.

Conclusions:

  • White dwarfs serve as powerful astrophysical laboratories for testing modified gravity theories.
  • The findings significantly narrow down the parameter space for scalar-tensor gravity models.
  • Future studies can leverage white dwarf properties for further gravitational tests.