Femtoscopy of the system shape fluctuations in heavy ion collisions

Abstract. Dipole, triangular, and higher harmonic flow that have an origin in the initial density fluctuations has gained a lot of attention as they can provide additional important information about the dynamical properties (e.g. viscosity) of the system. The fluctuations in the initial geometry should be also reflected in the detail shape and velocity field of the system at freeze-out. In this talk I discuss the possibility to measure such fluctuations by means of identical and non-identical particle interferometry. The initial spatial conditions in heavy ion collisions are not azimuthally symmetric. Due to particle rescatterings it leads to the anisotropic flow – anisotropies in particle momentum distributions – with elliptic flow being the well known example. Recently, a significant progress has been reached in understanding the role of the initial density fluctuations. In particular it was realized that such fluctuations lead to odd harmonic anisotropic flow, studying of which brings new insights into dynamics of the system evolution. Below, I briefly summarize recent developments. I apologize for not providing the full list of references – many of which can be found in other proceedings of this conference