Spikes in the Relic Graviton Background from Quintessential Inflation
Massimo Giovannini (Tufts University, Institute of Cosmology)

TL;DR
This paper predicts a sharp spike at 170 GHz in the gravitational wave spectrum from quintessential inflation, with potential implications for detection strategies of relic gravitons.
Contribution
It introduces a distinctive high-frequency spike in gravitational wave spectra specific to quintessential inflation models, contrasting with ordinary inflation.
Findings
Spike at 170 GHz with energy density of ~10^{-6}
Spectral differences between quintessential and ordinary inflation
Discussion on potential detection methods
Abstract
The energy spectra of gravitational waves (GW) produced in quintessential inflationary models increase in frequency and exhibit a sharp spike around 170 GHz where the associated fraction of critical energy density today stored in relic gravitons is of the order of . We contrast our findings with the spectra of ordinary inflationary models and we comment about possible detetction strategies of the spike.
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