White Dwarf Critical Tests for Modified Gravity

Preprint number: CP3-Origins-2015-54 DNRF90 and DIAS-2015-54
Authors: Rajeev Kumar Jain (CP3-Origins), Chris Kouvaris (CP3-Origins), and Niklas Grønlund Nielsen (CP3-Origins)
External link: arXiv.org

Scalar-tensor theories of gravity can lead to modifications of the gravitational force inside astrophysical objects. We exhibit that compact stars such as white dwarfs provide a unique set-up to test such deviations from Newtonian gravitational physics inside the stars. We obtain stringent and independent constraints on the parameter \(\Upsilon\) characterizing the deviations from gravity using the mass-radius relation, the Chandrasekhar mass limit and the maximal rotational frequency of white dwarfs. We find that white dwarfs impose stronger constraints on \(\Upsilon\) than the red and brown dwarfs.