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21.
Viewpoint

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.
22.
Viewpoint

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.
23.
Viewpoint

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.
24.
Focus

A Constant Worthy of the Name

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Phys. Rev. Focus 13, 13 (2004) – Published March 31, 2004
New astronomical observations contradict the claim that fundamental constants were different in the early universe.
25.
Focus

The Field that Ate the Milky Way

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Phys. Rev. Focus 12, 24 (2003) – Published December 19, 2003
Computer simulations support the controversial theory that the magnetic fields enveloping galaxies are as old as the Universe.
26.
Focus

A Galactic Condensate

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Phys. Rev. Focus 6, 5 (2000) – Published August 9, 2000
A new theory proposes that dark matter consists of particles so light that their quantum, wavelike nature dominates.
27.
Focus

Einstein’s “Mistake” is Revived

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Phys. Rev. Focus 4, 6 (1999) – Published July 30, 1999
Cosmologists have used recent data to constrain the type of ‘dark energy’ that may fill all of space.
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