This volume covers many different subjects, from very high energy cosmic rays to neutrino physics, gravitational waves and cosmology. Recent achievements and the exciting years to come are emphasized.

The Fourth International Workshop on New Worlds in Astroparticle Physics was the latest in the biennial series, held in Faro, Portugal. The program included both invited and contributed talks. Each of the sessions opened with a pedagogical overview of the current state of the respective field. The following topics were covered: cosmological parameters; neutrino physics and astrophysics; gravitational waves; beyond standard models: strings; cosmic rays: origin, propagation and interaction; matter under extreme conditions; supernovae and dark matter.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)

In international workshops on “New Worlds in Astroparticle Physics” held biannually, astronomers, astrophysicists and particle physicists discuss recent developments in the exciting and rapidly developing field of Astroparticle Physics. Similar to previous workshops, this 5th international workshop introduced experimental, observational and theoretical subjects through review lectures. This was followed by shorter contributions on the recent developments in Astroparticle Physics. This workshop covered an array of subjects like cosmic rays, gravitational waves, space radiation, neutrino physics, cosmological parameters, black holes, dark matter and dark energy.