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Positrons Galore

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Stephane Coutu, Physics 6, 40 (2013) – Published April 3, 2013
The first results from the space-borne Alpha Magnetic Spectrometer confirm an unexplained excess of high-energy positrons in Earth-bound cosmic rays.
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Can we test inflationary expansion of the early universe?

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Arthur Kosowsky, Physics 3, 103 (2010) – Published December 6, 2010
A set of proposed relations among observable quantities may allow strong tests of whether a rapid expansion of the very early universe produced the seeds of the large-scale structure we see today.
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Nothing there, yet

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Richard Schnee, Physics 3, 78 (2010) – Published September 20, 2010
Results from the first three weeks of running the XENON100 experiment show its promise as a sensitive detector of particle dark matter in the form of WIMPs.
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Cosmic light matter probes heavy dark matter

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Bruce Winstein and Kathryn M. Zurek, Physics 2, 37 (2009) – Published May 4, 2009
New results from the Fermi Gamma-Ray Space Telescope, the most precise to date in the energy range 20GeV to 1TeV, should help resolve whether cosmic rays composed of the lightest charged particles, i.e., electrons and positrons, come from dark matter or some other astrophysical source.
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Debating the source of a rare particle

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Simon Swordy, Physics 2, 10 (2009) – Published February 2, 2009
Many cosmologists believe that antiprotons in cosmic rays come from the annihilation of dark matter. Data from the PAMELA experiment on board a Russian satellite provide an important test of this possibility.
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Scaling up the search for dark matter

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Karl van Bibber, Physics 2, 2 (2009) – Published January 5, 2009
New upper limits on the spin-independent interaction of WIMPs and nucleons marks the latest volley in the worldwide effort to detect and identify particle dark matter.