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论文题目:	Resonant multiple peaks in the induced gravitational waves
论文题目英文:
作者:	Cai, Rong-Gen; Pi, Shi; Wang, Shao-Jiang; Yang, Xing-Yu
论文出处:
刊物名称:	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
年:	2019
卷:
期:	5
页:	13
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摘要:	We identify analytically a multiple-peak structure in the energy-density spectrum of induced gravitational waves (GWs) generated at second-order from primordial scalar perturbations also with multiple (n) peaks at small scales k(*i). The energy-density spectrum of induced GWs exhibits at most C(n+1)(2)and at least n peaks at wave-vectors kij equivalent to (k(*i) + k(*j)) / root 3 due to resonant ampli fi cation, and, under the narrow-width approximation, it contains an universal factor that can be interpreted as a result of momentum conservation. We also extend these discussions to the case of non-Gaussian perturbations.
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