| Speaker: |
Xin Wang (University of Padua) |
| Title: |
An Audible Origin of Cosmic Structure: Primordial Perturbations and Gravitational Waves from a Modulated Phase Transition |
| Date (JST): |
Wed, Nov 18, 2026, 13:30 - 15:00 |
| Place: |
Seminar Room A |
| Abstract: |
Understanding the origin of large-scale curvature perturbations is a central challenge in cosmology. In this talk, I will present a mechanism in which fluctuations of a light spectator field acquired during inflation are converted into curvature perturbations by modulating a subsequent first-order phase transition. The same transition can generate a loud stochastic gravitational-wave background in the LISA band with enhanced anisotropies correlated with the cosmic microwave background. I will illustrate this mechanism with a concrete benchmark and discuss how gravitational-wave observations could shed light on the origin of cosmic structure.
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