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astro-ph.CO2025★ 2 cited
Gravitational waves from axion inflation in the gradient expansion formalism. Part II. Fermionic axion inflation
Richard von Eckardstein, Kai Schmitz, Oleksandr Sobol
Axion inflation represents an intriguing source of gravitational waves (GWs) from the early Universe. In a companion paper, arXiv:2508.00798, we previously leveraged the gradient e…
astro-ph.CO2025★ 4 cited
Gravitational waves from axion inflation in the gradient expansion formalism. Part I. Pure axion inflation
Richard von Eckardstein, Kai Schmitz, Oleksandr Sobol
Axion inflation is a well-motivated model of cosmic inflation with a rich phenomenology. The abundant production of gauge fields during axion inflation notably sources a stochastic…