Massive white dwarfs in Rastall-Rainbow gravity

Abstract We explore the properties of white dwarfs within the framework of Rastall-Rainbow gravity. Employing the Chandrasekhar equation of state in conjunction with the modified Tolman-Oppenheimer-Volkoff equation, we calculate the mass-radius relations of white dwarfs. We also obtain the confidence levels for the Rastall-Rainbow parameters based on some observed white dwarfs. Numerical results show that Rastall-Rainbow gravity can not only align well with these observations, but also can account for the existence of the super-Chandrasekhar white dwarfs. In addition, the gravitational redshift, compactness and dynamical stability of white dwarfs are discussed in this modified gravitational theory.

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