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Instability in axion inflation with strong backreaction from gauge modes
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abstract
We perform an analytical study of the stability of the background solution of the model in which an inflaton, through an axionic coupling to a $U(1)$ gauge field, causes an amplification of the gauge field modes that strongly backreact on its dynamics. To this goal, we study the evolution of the gauge field modes coupled to the inflaton zero mode, treating perturbatively the deviation of the inflaton velocity from its mean-field value. As long as the system is in the strong backreaction regime we find that the inflaton velocity performs oscillations of increasing amplitude about the value it would have in the approximation of constant velocity, confirming an instability that has been observed in numerical studies.
Forward citations
Cited by 5 Pith papers
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Axion Inflation: Perturbative control in the strong backreaction regime
Axion inflation with strong gauge-field backreaction is generically non-perturbative for ξ ≳ 2.5, yet a newly found steady 'mild backreaction' phase at large β can stay perturbatively controlled.
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Ab Initio Cosmological Simulations: From Inflation to Present-Day Structure Formation
Nonlinear axion-U(1) inflation, simulated on a lattice and fed into N-body simulations, boosts small-scale structure and high-redshift halo counts by up to ~200% relative to standard single-field initial conditions.
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High-frequency gravitational waves from axion inflation in the weak-backreaction regime
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Axion USR Inflation
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CMB constraints on $U(1)$ axion warm inflation
Axion-driven warm inflation with U(1) gauge fields is constrained with CMB data and remains viable for sub-Planckian decay constants, but requires large Chern-Simons couplings.
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