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- W2975989719 abstract "The canonical scalar-tensor theory model which exhibits spontaneous scalarization in the strong-gravity regime of neutron stars has long been known to predict a cosmological evolution for the scalar field which generically results in severe violations of present-day Solar System constraints on deviations from general relativity. We study if this tension can be alleviated by generalizing this model to include a disformal coupling between the scalar field $varphi$ and matter, where the Jordan frame metric ${tilde g}_{munu}$ is related to the Einstein frame one $g_{munu}$ by ${tilde g}_{munu}=A(varphi)^2 (g_{munu}+Lambda, partial_mu varphi , partial_nuvarphi)$. We find that this broader theory admits a late-time attractor mechanism towards general relativity. However, the existence of this attractor requires a value of disformal scale of the order $Lambdagtrsim H_0^{-2}$, where $H_0$ is the Hubble parameter of today, which is much larger than the scale relevant for spontaneous scalarization of neutron stars $Lambda sim R_s^{2}$ with $R_s (sim 10^{-22} H_0^{-1})$ being the typical radius of these stars. The large values of $Lambda$ necessary for the attractor mechanism (i) suppress spontaneous scalarization altogether inside neutron stars and (ii) induce ghost instabilities on scalar field fluctuations, thus preventing a resolution of the tension. We argue that the problem arises because our disformal coupling involves a dimensionful parameter." @default.
- W2975989719 created "2019-10-03" @default.
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- W2975989719 date "2019-11-07" @default.
- W2975989719 modified "2023-09-25" @default.
- W2975989719 title "Cosmological attractors to general relativity and spontaneous scalarization with disformal coupling" @default.
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- W2975989719 doi "https://doi.org/10.1103/physrevd.100.104012" @default.
- W2975989719 hasPublicationYear "2019" @default.
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