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Horndeski under the quantum loupe

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With recent constraints on the propagation speed of gravitational waves, the class of scalar-tensor theories has significantly been reduced. We consider one of the surviving models still relevant for cosmology and investigate its radiative stability. The model contains operators with explicit breaking of the Galileon symmetry and we study whether they harm the re-organization of the effective field theory. Within the regime of validity we establish a non-renormalization theorem and show explicitly that the quantum corrections, to one-loop, do not detune the classical Lagrangian generating suppressed counterterms. This is striking since the non-renormalization theorem is established in the presence of a genuine Galileon symmetry breaking term.
Original languageEnglish
Article number010
Pages (from-to)1-23
Number of pages23
JournalJournal of Cosmology and Astroparticle Physics
Volume2020
Issue number10
DOIs
Publication statusPublished - 2 Oct 2020

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