1,894 research outputs found
Using sounds and sonifications for astronomy outreach
Good astronomy pictures, like those of the HST, play an important and wellknown role in astronomy outreach, triggering curiosity and interest. This same aim can also be achieved by means of sounds. Here we present the use of astronomy-related sounds and data sonifications to be used in astronomy outreach. These sounds, which people are unlikely to hear in the normal course of things, are a good tool for stimulating interest when teaching astronomy. In our case, sounds are successfully used in ‘‘The sounds of science,’’ a weekend science-dissemination program heard on the principal national radio station, Radio Nacional de Espan˜a (RNE). But teachers can also easily make use of these sounds in the classroom, since only a simple cassette player is needed
Poisson-Lie groups, bi-Hamiltonian systems and integrable deformations
Given a Lie-Poisson completely integrable bi-Hamiltonian system on
, we present a method which allows us to construct, under certain
conditions, a completely integrable bi-Hamiltonian deformation of the initial
Lie-Poisson system on a non-abelian Poisson-Lie group of dimension
, where is the deformation parameter. Moreover, we
show that from the two multiplicative (Poisson-Lie) Hamiltonian structures on
that underly the dynamics of the deformed system and by making use of
the group law on , one may obtain two completely integrable Hamiltonian
systems on . By construction, both systems admit
reduction, via the multiplication in , to the deformed bi-Hamiltonian
system in . The previous approach is applied to two relevant
Lie-Poisson completely integrable bi-Hamiltonian systems: the Lorenz and Euler
top systems.Comment: 23 pages, 2 figures. Revised versio
- …