Séminaire / Seminar GReCO |
| « Induced Gravitational Waves and Matter-Dominated Era » |
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Takahiro Terada |
| The detection of nanohertz gravitational waves (GWs) by pulsar timing arrays may be signaling the beginning of the era of GW cosmology driven by observations. One of the cosmological sources of the GWs is primordial curvature perturbations. The GWs induced by curvature perturbations can be used to probe inflation and the thermal history of the Universe, test the primordial black hole scenario, explain the PTA data, and even test ideas in quantum gravity. In particular, we focus on the effects of an early matter-dominated (MD) era on the induced GWs and find that the induced GWs are suppressed (enhanced) when the change of the equation of state of the Universe at the end of the MD era is slow (rapid). This fact allows us to probe some part of the parameter space of models/scenarios such as evaporating PBHs and axion rotation by future GW observations. |
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lundi 4 novembre 2024 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |