Gravity Waves and Primordial Black Holes in Scalar Warm Little Inflation Bastero Gil, Mar Subías Díaz-Blanco, Marta This work has been partially supported by MICINN (PID2019-105943GB-I00/AEI/10.13039/501100011033) and Junta de Andalucía" grants P18-FR-4314 and A-FQM-211-UGR18. In warm inflation, dissipation due to the interactions of the inflaton field to other light degrees of freedom leads naturally to the enhancement of the primordial spectrum during the last 10-20 efolds of inflation. We study this effect in a variant of the Warm Little Inflaton model, where the inflaton couples to light scalars, with a quartic chaotic potential. These large fluctuations on re-entry will form light, evaporating Primordial Black Holes, with masses lighter than 10(6) g. But at the same time they will act as a source for the tensors at second order. The enhancement is maximal near the end of inflation, which result in a spectral density of Gravitational Waves (GW) peaked at frequencies f similar to O(10(5) - 10(6)) Hz today, and with an amplitude Omega(GW) similar to 10(-9). Although the frequency range is outside the reach of present and planned GW detectors, it might be reached in future high-frequency gravitational waves detectors, designed to search for cosmological stochastic GW backgrounds above MHz frequencies. 2022-02-02T08:38:01Z 2022-02-02T08:38:01Z 2021-12-15 journal article Published version: Mar Bastero-Gil and Marta Subías Díaz-Blanco JCAP12(2021)052. [10.1088/1475-7516/2021/12/052] http://hdl.handle.net/10481/72600 eng http://creativecommons.org/licenses/by-nc-nd/3.0/es/ open access Atribución-NoComercial-SinDerivadas 3.0 España Institute of Physics