paper

Subtleties in constraining gravity theories with mass-radius data

arXiv:2303.01910 · doi:10.1103/PhysRevD.108.024028

Abstract

Simultaneous measurements of neutron star masses and radii can be used to constrain deviations from general relativity (GR) as was recently demonstrated for the spontaneous scalarization model of Damour and Esposito-Farèse (DEF). Here, we investigate the general applicability of the same procedure beyond this single example. We first show that a simple variation of the DEF model renders the same mass-radius measurements ineffective for obtaining constraints. On the other hand, a recently popular and distinct model of scalarization that arises in scalar-Gauss-Bonnet theory can be constrained similarly to the original DEF model, albeit due to a slightly different underlying mechanism. These establish that using the mass-radius data can potentially constrain various theories of gravity, but the method also has limitations.

arXiv comment18 pages, 11 figures. Published version. A larger dataset was used in the analysis and a chapter explaining the effect of the dataset size is added in this version

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