Speaker
Sk Jahanur Hoque
(BITS Pilani, Hyderabad campus)
Description
The physics of gravitational waves is well understood for asymptotically flat space-times. Asymptotic flatness presumes a vanishing cosmological constant. However, cosmological observations over the decades have indicated that our universe is undergoing an accelerated expansion, which is most simply modelled by a de Sitter universe or equivalently by a positive cosmological constant. Even a tiniest value of positive cosmological constant profoundly alters the asymptotic structure of space-times, forcing a re-look at the theory of gravitational radiation. We will present an overview of the study of gravitational radiation in the de Sitter universe. We will discuss the progress and state-of-the-art of the subject.
