Séminaire / Seminar GReCO |
| « Probing inflation and reheating with gravitational waves » |
|
Sriramkumar Lakshmanan |
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During the past decade, the detection of gravitational waves
(GWs) from merging compact binaries by the Laser Interferometer Gravitational-Wave Observatory has opened up a new window to observe our universe. In the initial part of the talk, I will describe non-trivial dynamics during the later stages of inflation (involving a brief phase of ultra slow roll) and the period of reheating (which connects the epochs of inflation and radiation domination) that can generate primordial GWs of strengths detectable by the ongoing and forthcoming GW observatories. In the latter part of the talk, I will discuss the manner in which the recent observations by the pulsar timing arrays (that suggest a stochastic GW background) can possibly constrain the period of reheating and the strengths of the primordial magnetic fields. I will also take the opportunity to discuss the extent of non-Gaussianities generated due to a phase of ultra slow roll inflation and the possible implications of the non-trivial inflationary dynamics during the phase for the higher order contributions to the scalar power spectrum. |
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lundi 3 juin 2024 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |