A new type of gravitational-wave detection of low-frequency based on pulsars (https://arxiv.org/abs/2306.16219, https://arxiv.org/pdf/2306.16214) has revealed as signal that is so far not well described by standard astrophysical explanations as super-massive black holes. If the signal is interpreted as a signal of a first order transition from the early universe, it points to the temperature range of the QGP-hadron transition.
We take this observation as an opportunity for these seminars held at Salle Galilée (Orme des Merisiers, b.713):
9:30-9:50 Antoine Petiteau (IRFU DPhP): Gravitational waves signal by pulsar time array
9:50-10:15 Hippolyte Quelquejay Leclere (APC): Last studies on phase transitions and Pulsar Time Array
10:15-10:30 Coffee break
10:30-11:15 Jacopo Ghiglieri (Subatech): The QCD phase structure relevant for early universe cosmology
11:15-11:45 Open discussion
Antoine is co-author of one of the two publications and PI of LISA-France, a future gravitational wave laboratory based on satellites with a frequency domain interesting for the electroweak phase transition in the early universe.
Hippolyte is a PhD student working at APC on the very topic of the interpretation of the signal in view of phase transitions in the early universe.
Jacopo is working on the theory of heavy-ion collisions and the early universe with the help of thermal field theory and effective theory.
This seminar at Saclay gives the opportunity to dream a bit about physics before Christmas.