This week's paper was "An Anomalous Positron Abundance in Cosmic Rays with Energies 1.5-100 GeV" by Adriani et al., Nature, 2009. It discusses recent results from the PAMELA mission that suggest that the spectrum of cosmic rays is inconsistent with secondary production in the ISM, and may require a primary source, such as dark matter.
Astro-ph version can be found here:
![[WWW]](/modern/img/moin-www.png){kind=small}
http://lanl.arxiv.org/abs/0810.4995