Constraining early dark energy with gravitational waves before recombination

Zachary J. Weiner, Peter Adshead, John T. Giblin

Research output: Contribution to journalArticlepeer-review


We show that the nonperturbative decay of ultralight scalars into Abelian gauge bosons, recently proposed as a possible solution to the Hubble tension, produces a stochastic background of gravitational waves which is constrained by the cosmic microwave background. We simulate the full nonlinear dynamics of resonant dark photon production and the associated gravitational-wave production, finding the signals to exceed constraints for the entire parameter space we consider. Our findings suggest that gravitational-wave production from the decay of early dark energy may provide a unique probe of these models.

Original languageEnglish (US)
Article numberL021301
JournalPhysical Review D
Issue number2
StatePublished - Jan 12 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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