BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Nicolás Bernal (New York University Abu Dhabi) DTSTART:20250429T133000Z DTEND:20250429T143000Z DTSTAMP:20260423T022918Z UID:JCsabroso/1 DESCRIPTION:Title: Pre-thermalized Gravitational Waves\nby Nicolás Bernal (New York Un iversity Abu Dhabi) as part of El Journal Club más Sabroso\n\n\nAbstract\ nWe investigate a novel gravitational wave (GW) production mechanism from gravitons generated during the pre-thermal phase of cosmic reheating\, whe re the energy density is dominated by non-thermalized inflaton decay produ cts\, dubbed reheatons. We consider multiple production channels\, includi ng: $i)$ pure inflaton-inflaton annihilation\, $ii)$ graviton Bremsstrahlu ng from inflaton decay\, $iii)$ scatterings between an inflaton and a rehe aton\, and $iv)$ scatterings among reheatons. To determine the resulting G W spectrum\, we solve the Boltzmann equation to obtain the graviton phase- space distribution for each channel. We find that the third channel\, $iii )$\, dominates due to the large occupation number of reheatons at highly-e nergetic states during the pre-thermalization phase. Notably\, in scenario s with a low inflaton mass\, the GW spectrum could fall within the sensiti vity range of future experiments such as the Einstein Telescope\, the Cosm ic Explorer\, the Big Bang Observer\, and ultimate DECIGO.\n LOCATION:https://researchseminars.org/talk/JCsabroso/1/ END:VEVENT END:VCALENDAR