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Cosmology with subdominant Horndeski scalar field

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arxiv 1903.05427 v3 pith:TQXH7GAM submitted 2019-03-13 gr-qc astro-ph.COhep-th

Nicola Franchini , Thomas P. Sotiriou This is my paper · ORCID
classification gr-qcastro-ph.COhep-th
keywords scalarfieldconstraintcosmiccosmologicalcouplingevolutiongauss-bonnet
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We study the cosmological evolution of a scalar field in Horndeski gravity, assuming that the scalar field is subdominant with respect to the cosmic fluid. We first analyse the most general shift-symmetric action that respects local Lorentz symmetry. We show that the bound on the speed of gravitational waves set by GW170817+GRB170817A imposes a constraint only on the linear coupling between the scalar and the Gauss-Bonnet invariant and this constraint is rather mild. Then, we consider some interesting examples of theories that break shift-symmetry, such as the Damour-Esposito-Far\`ese model of spontaneous scalarization and a theory with a quadratic coupling to the Gauss-Bonnet invariant that can lead to black hole scalarization. In both cases, tuning of cosmological initial conditions is necessary to keep the scalar field dormant during cosmic evolution.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Spontaneous scalarization of charged black holes in the Scalar-Vector-Tensor theory

    gr-qc 2019-08 conditional novelty 6.0 of 10

    Spontaneous scalarization of Reissner-Nordström black holes occurs in the scalar-vector-tensor f4 model, and the resulting scalarized black holes can be overcharged.

  2. Primordial black hole dark matter from ultra-slow-roll inflation in Horndeski gravity

    gr-qc 2025-12 conditional novelty 5.0 of 10

    A kinetic cubic Horndeski coupling creates an ultra-slow-roll phase that amplifies curvature perturbations enough to produce asteroid-mass primordial black holes, potentially 90% of dark matter.

  3. Compact Objects in Einstein-scalar-Gauss-Bonnet Theory and beyond

    gr-qc 2024-12 unverdicted novelty 2.0 of 10

    A review of compact-object solutions in Einstein-scalar-Gauss-Bonnet and Horndeski theories, emphasizing scalarized black holes, traversable wormholes, and bubble-like particle solutions.

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