Abstract: Our Universe is undoubtely relativistic: it comes from a Big Bang, it bends light, it is rippled by gravitational waves. Yet, certain phenomena, like the growth of cosmic structures such as galaxies, have traditionally been described by non-relativistic gravity — a fully relativistic approach being too complex for our current technology. In this talk, I will discuss a number of steps that have been taken recently to break this technological barrier. In particular, I will describe the emergence of numerical-relativity codes capable of computing simple cosmological models in full relativistic terms, and the corrections they have enabled us to measure so far in the growth of cosmic structures, the receding speed of distant objects, and the propagation of light in inhomogeneous spacetimes. Systematic studies of these relativistic corrections will be integral to the success of future space missions aimed at building a high-precision picture of our cosmic habitat.

Relatore: Eloisa Bentivegna - Università di Catania

Giovedi, 06/04/2017
Ore: 16:30

Aula Feynman (Plesso Fisico)

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