Speaker
Description
The early universe provides a natural testing ground for theories beyond the Standard Model. One well-motivated extension is the introduction of first-order phase transitions, which generically produce a stochastic gravitational wave (GW) background. In this work, we study GWs sourced by decaying turbulence and highlight the role of the relevant time scales, most notably the decay parameter and the turbulence duration, which govern distinct dynamical regimes of the system. Assuming the electroweak phase transition scale (~160 GeV), the resulting signal peaks in the LISA band (0.1 mHz – 1 Hz), while a QCD-scale transition (~100 MeV) would produce GWs in the nHz range (1–100 nHz), accessible to pulsar timing arrays. Upcoming observations can therefore constrain the relevant parameter space across complementary frequency bands.