Part 2: Dark Matter, Dark Energy or must we upgrade Einstein Theory of Gravity?
David Fonseca Mota from the Institute of Theoretical Astrophysics at UiO will present us his work. He comes for the second time in our group, and he will present us the second part of his talk (see the complete summary under).
Do astronomical observations indicate the existence of a matter-energy component which is “dark” or are they just telling us that our laws of gravity break down at large scales? Such question has been raised several times in the last 150 years. In this talk, I give a short historical overview of this issue and the different theoretical solutions that have been put forward to explain the data. In particular, I go over the observational evidence for dark matter and the possible candidates. Finally, I focus on the present day acceleration of the Universe and the possible ways to explain it. All in the spirit of the question: Is there really a dark sector or must we go beyond Einstein'sGeneral Relativity?