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\bibitem{He:2021bqm}
Y.~He, A.~Brandenburg and A.~Sinha, \emph{{Tensor spectrum of
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C.~de~Rham and S.~Melville, \emph{{Gravitational Rainbows: LIGO and Dark Energy
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L.~Lombriser and A.~Taylor, \emph{{Breaking a Dark Degeneracy with
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J.~Kennedy, L.~Lombriser and A.~Taylor, \emph{{Reconstructing Horndeski
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M.~Denissenya and E.V.~Linder, \emph{{Gravity's Islands: Parametrizing
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M.~Yoshimura, \emph{{Stronger gravity in the early universe}},
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M.~Zumalacarregui, \emph{{Gravity in the Era of Equality: Towards solutions to
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M.~Braglia, M.~Ballardini, F.~Finelli and K.~Koyama, \emph{{Early modified
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E.V.~Linder, \emph{{Gravitational Wave Distances in Horndeski Cosmology}},
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A.~Roper~Pol, S.~Mandal, A.~Brandenburg, T.~Kahniashvili and A.~Kosowsky,
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A.~Roper~Pol, C.~Caprini, A.~Neronov and D.~Semikoz, \emph{{Gravitational wave
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M.~Hindmarsh and M.~Hijazi, \emph{{Gravitational waves from first order
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\bibitem{Brandenburg:2021bvg}
A.~Brandenburg, G.~Gogoberidze, T.~Kahniashvili, S.~Mandal, A.~Roper~Pol and
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\bibitem{RoperPol:2021xnd}
A.~Roper~Pol, S.~Mandal, A.~Brandenburg and T.~Kahniashvili,
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\bibitem{Moore:2014lga}
C.J.~Moore, R.H.~Cole and C.P.L.~Berry, \emph{{Gravitational-wave sensitivity
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\bibitem{Schmitz:2020syl}
K.~Schmitz, \emph{{New Sensitivity Curves for Gravitational-Wave Signals from
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\bibitem{NANOGrav:2020bcs}
{\scshape NANOGrav} collaboration, \emph{{The NANOGrav 12.5 yr Data Set: Search
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\bibitem{DATA}
Y.~{He}, A.~{Roper Pol} and A.~{Brandenburg}, \emph{{Datasets of ``Modified
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\bibitem{BS21}
A.~Brandenburg and R.~Sharma, \emph{{Simulating Relic Gravitational Waves from
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\end{thebibliography}\endgroup
