The problem of ultracold interacting Bose gas was intensively studied since 1995, when the condensation of trapped alkali atoms was achieved for the first time. The usual framework in order to deal with these systems consists in replacing the true interaction with an effective pseudo-potential. In these proceedings we analyze two different situations: the well-known contact interaction approximation and the currently widely under investigation case of dipolar condensates where, in addition to the usual zero-range contribution, we have a long-range anisotropic component. In the former case we present a slightly different approach to study the dynamics of a non-condensed Bose gas, based on a strong formal analogy with plasma physics; for example, we will be able to show the occurring of Landau damping in a quasi-1D Bose gas. Concerning the case of dipolar atoms, recent experimental activities showed strikingly new dynamical features: properly quenching the ratio between the dipolar interaction strength and contact one, the system displays a clusterization in a pattern of smaller droplets, which reminds the Rosensweig instability typical of classical ferrofluids.
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