Speaker
Wenyuan Ai
(Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
Description
First-order phase transitions in the early Universe are a well-motivated source of gravitational waves. In this talk, I will discuss a previously overlooked gravitational wave production mechanism: gravitational transition radiation, arising from graviton emission by particles whose mass changes as they pass through expanding bubble walls. The resulting spectrum features a distinctive shape with a peak frequency redshifting to 10 GHz, corresponding to the current temperature of the Universe. This mechanism is generic and is expected to operate similarly for domain walls and other relativistic interfaces.
Primary author
Wenyuan Ai
(Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
