Astrophysics Seminars

Using hydro-cosmological simulations and analytic modeling, we attempt solid predictions for the formation of massive galaxies at high redshift within the LCDM cosmology. The emerging new picture highlights the formation of galaxies at the nodes of...

In the last few decades, advances in observational cosmology have given us a standard model of cosmology. We know the content of the universe to within a few percent. With more ambitious experiments on the way, we hope to move beyond the knowledge...

In the early stages of planet formation dust grains collect to form km-sized planetesimals. Growth beyond a few cms is frustrated by collisional shattering and rapid radial drift of pebbles and rocks. I will present my work on the dynamics of...

In a planetary system with well-spaced planets, there is a nonlinear instability that can lead to chaotic behaviour. One of the planets may gradually become unstable, in which case its orbit can become highly eccentric and/or inclined. If an...

Theories that attempt to explain the observed cosmic acceleration generally introduce new degrees of freedom (such as a scalar) that are active on large scales but must be screened on small scales. We show that O(1) equivalence principle violations...