We need lab experiments to look for axion-like particles
  The PVLAS signal has renewed the interest in light bosons coupled to the electromagnetic field. However, astrophysical bounds coming from the lifetime of the sun and the CAST experiment are seemingly in conflict with this result. We discuss effective models that allow to suppress production of axion-like particles in the sun and thereby relax the bounds by some orders of magnitude. This stresses the importance of laboratory searches. 
Joerg Jaeckel, Eduard Masso, Javier Redondo, Andreas Ringwald,   Fuminobu Takahashi