Christophe Pichon: Spin alignments within the cosmic web: a theory of constrained tidal torques near filaments

jeudi 26 nov. 2015, 14:00 → 15:00 Europe/Paris

Charpak (LPNHE)

The geometry of the cosmic web drives in part the spin acquisition of galaxies. This can be explained in a Lagrangian framework, by identifying the specific long-wavelength correlations within the primordial Gaussian random field which are relevant to spin acquisition. Tidal Torque Theory is revisited in the context of such anisotropic environments, biased by the presence of a filament within a wall. The point process of filament-type saddles represents it most efficiently. The constrained misalignment between the tidal and the inertia tensors in the vicinity of filament-type saddles simply explains the distribution of spin directions.