White Dwarf Critical Tests for Modified Gravity

Abstract

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 beyond Horndeski theories of ${\mathrm{G}}^3$ type. We obtain stringent and independent constraints on the parameter ${\rm Y}$ characterizing the deviations from Newtonian 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 ${\rm Y}$ than red and brown dwarfs.

V2: 6 pages, 4 figures, minor revisions, to appear in Physical Review Letters

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