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Dark energy loopholes some time after GW170817

Bordin, Lorenzo; Copeland, Edmund J; Padilla, Antonio

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Lorenzo Bordin


We revisit the constraints on scalar tensor theories of modified gravity following the purge of GW170817. We pay particular attention to dynamical loopholes where the anomalous speed of propagation of the gravitational wave can vanish on-shell, when we impose the dynamical field equations. By working in the effective field theory formalism we are able to improve on previous analyses, scanning a much wider class of theories, including Beyond Horndeski and DHOST. Furthermore, the formalism is well adapted to consider the effect of inhomogeneous perturbations, where we explicitly take into account the fact that the galactic overdensities are pressureless to leading order.


Bordin, L., Copeland, E. J., & Padilla, A. (2020). Dark energy loopholes some time after GW170817. Journal of Cosmology and Astroparticle Physics, 2020(11), Article 063.

Journal Article Type Article
Acceptance Date Oct 6, 2020
Online Publication Date Nov 30, 2020
Publication Date 2020-11
Deposit Date Oct 28, 2020
Publicly Available Date Dec 1, 2021
Journal Journal of Cosmology and Astroparticle Physics
Electronic ISSN 1475-7516
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2020
Issue 11
Article Number 063
Keywords dark energy theory, gravitational waves / theory, modified gravity
Public URL
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