2021
DOI: 10.1088/1475-7516/2021/08/030
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Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation

Abstract: We identify a characteristic pattern in the scalar-induced stochastic gravitational wave background from particle production during inflation. If particle production is sufficiently efficient, the scalar power spectrum exhibits O(1) oscillations periodic in k, characteristic of a sharp feature, with an exponentially enhanced envelope. We systematically study the properties of the induced spectrum of gravitational waves sourced after inflation and find that this inherits the periodic structure in k, resulting i… Show more

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Cited by 113 publications
(210 citation statements)
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References 105 publications
(207 reference statements)
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“…In single field models, the special feature that amplifies the power spectrum can be either an inflection point [104][105][106] or a step-like transition in the inflationary plateau [107,108] 4 . The presence of step-like, or generally sharp, features in the inflation potential results in amplification and, additionally, in oscillatory patterns in the curvature power spectrum [108,111]. The potential might feature more than one steps, so that the relevant enhancement in the power spectrum becomes strong enough.…”
Section: Pbhs From Runaway Inflation Modelsmentioning
confidence: 99%
“…In single field models, the special feature that amplifies the power spectrum can be either an inflection point [104][105][106] or a step-like transition in the inflationary plateau [107,108] 4 . The presence of step-like, or generally sharp, features in the inflation potential results in amplification and, additionally, in oscillatory patterns in the curvature power spectrum [108,111]. The potential might feature more than one steps, so that the relevant enhancement in the power spectrum becomes strong enough.…”
Section: Pbhs From Runaway Inflation Modelsmentioning
confidence: 99%
“…On smaller scales, a transient phase of strongly non-geodesic motion provides a natural mechanism to boost the amplitude of primordial fluctuations and hence generate primordial black holes [33,34]. Independently, if this phase is short enough, the primordial power spectrum exhibits order one oscillations characteristic of sharp features, that are transferred to visible oscillations in the frequency profile of the scalar-induced stochastic gravitational wave background [35].…”
Section: Pos(eps-hep2021)128mentioning
confidence: 99%
“…That enhanced primordial density fluctuations from inflationary models with large curvature perturbations on small scales is the mainstream scenario for PBH formation. PBHs from models of inflation, with targeting masses spanning in the range of 10 −17 -10 9 M , can be realized either in the single-field [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] or multi-field [22][23][24][25][26][27][28][29][30][31][32][33][34][35] framework.…”
Section: Introductionmentioning
confidence: 99%
“…35) and(2.36) are scale-dependent functions of τ * = k/k * . Since δ 3 > 0 implies an enhancement of 3 , we find that end = (η end ) = * x −2δ 2…”
mentioning
confidence: 99%
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