Whispers of Supergravity in Gravitational Wave Backgrounds: Determining the Gravitino Mass from Cosmic Thermal History
The research investigates how gravitino masses above the electroweak scale affect cosmic thermal history and leave a unique signature in primordial gravitational wave backgrounds. By analyzing two characteristic frequencies in this background, researchers can directly infer both the gravitino mass and its initial abundance, providing an observational probe for high-scale supergravity.