高能暂现源 · 每日文献综述

We analyze GW production during self-resonant preheating with energy transfer via ϕχ <SUP>2</SUP>, in which ϕ and χ correspond to the inflaton and the daughter field, respectively. Linear Floquet analysis and nonlinear simulations show that ϕ fluctuations grow by parametric resonance, while χ undergoes tachyonic bursts. The dominant contribution to the GW spectrum arises from parametric resonance in the case of an effective quartic potential, with model parameters consistent with CMB observations. In a well-motivated α-attractor inflationary scenario, the present-day redshifted spectrum attains a peak amplitude of h <SUP>2</SUP>Ω<SUB>GW</SUB> <SUP>(0)</SUP> ∼ 10<SUP>-11</SUP> at a peak frequency f<SUB>p</SUB> <SUP>(0)</SUP> ∼ 10<SUP>7</SUP> Hz.