PAU is the first european collaboration between Particle Physicists and Astronomers. We are brought together by the common interest of understanding the physics of the accelerating Universe.
Understanding the apparent acceleration of the Universe is one of the most outstanding problems in cosmology today.
The leading explanations for this effect are either that the Universe is dominated by a negative pressure energy component (the dark energy), or that gravity deviates from General Relativity.
The observed acceleration rate of the expanding universe demonstrates that our well established theories of particles and gravity are incomplete, if not incorrect. For this reason while this problem emerged within the context of cosmology it has repercussions in fundamental physics.
In this research area there is a convergence of several fields, namely particle physics, gravitation and astrophysics. We believe that the best approach to understand dark energy is to have a team with expertise in all these fields, where both theorists and experimenters work together.
These are the main objectives of our collaboration:
* Design, build and lead the first European Baryon Acoustic Oscillations project.
* Develop the theory. In fact it is a puzzle why the acceleration is not much larger than observed.
* Provide the framework for theorists and observers to think jointly on this problem and for interpreting the observations.
* Educate a new generation of scientists to understand observations in detail, but in the context of the big picture.
* Outreach: disseminate the results to the general public.