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• W3126984984 endingPage "054" @default.
• W3126984984 startingPage "054" @default.
• W3126984984 abstract "We study the slow-roll single field inflation in the context of the consistent $Dto4$ Einstein-Gauss-Bonnet gravity that was recently proposed in cite{Aoki:2020lig}. In addition to the standard attractor regime, we find a new attractor regime which we call the Gauss-Bonnet attractor as the dominant contribution comes from the Gauss-Bonnet term. Around this attractor solution, we find power spectra and spectral tilts for the curvature perturbations and gravitational waves (GWs) and also a model-independent consistency relation among observable quantities. The Gauss-Bonnet term provides a nonlinear $k^4$ term to the GWs dispersion relation which has the same order as the standard linear $k^2$ term at the time of horizon crossing around the Gauss-Bonnet attractor. The Gauss-Bonnet attractor regime thus provides a new scenario for the primordial GWs which can be tested by observations. Finally, we study non-Gaussianity of GWs in this model and estimate the nonlinear parameters $f^{s_1s_2s_3}_{rm NL,;sq}$ and $f^{s_1s_2s_3}_{rm NL,;eq}$ by fitting the computed GWs bispectra with the local-type and equilateral-type templates respectively at the squeezed limit and at the equilateral shape. For helicities $(+++)$ and $( -- )$, $f^{s_1s_2s_3}_{rm NL,;sq}$ is larger while $f^{s_1s_2s_3}_{rm NL,;eq}$ is larger for helicities $(++-)$ and $(--+)$." @default.
• W3126984984 created "2021-02-15" @default.
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• W3126984984 date "2021-01-26" @default.
• W3126984984 modified "2023-09-30" @default.
• W3126984984 title "Inflationary gravitational waves in consistent <i>D</i> → 4 Einstein-Gauss-Bonnet gravity" @default.
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• W3126984984 doi "https://doi.org/10.1088/1475-7516/2021/01/054" @default.
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