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Physics 2, 92 (2009) – Published November 2, 2009 Defects—in the form of vortices in superconductors or “strings” in the fabric of the universe—can reveal the state of a system at the time it was cooled. |
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Published May 26, 2009 Astrophysics Cosmology Particles & Fields Detectors buried beneath the Antarctic ice place stringent limits on the presence of dark matter particles, called neutralinos, in the sun. |
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Physics 2, 37 (2009) – Published May 4, 2009 Particles & Fields Astrophysics Cosmology New results from the Fermi Gamma-Ray Space Telescope, the most precise to date in the energy range 20 GeV to 1 TeV, 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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Published February 23, 2009 Two antimatter measurements performed by the PAMELA experiment appear to lead to conflicting results. Now, theorists are exploring the extent to which these measurements can be reconciled. |
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Published February 9, 2009 Interactions between dark matter particles may explain unusual matter-antimatter production rates in the universe. |
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Physics 2, 10 (2009) – Published February 2, 2009 Astrophysics Particles & Fields Cosmology 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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Physics 2, 2 (2009) – Published January 5, 2009 Astrophysics Particles & Fields Cosmology 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. |
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Published December 22, 2008 Mounting evidence seems to rule out weakly interacting massive particles (WIMPs ) as the source of a so-far unexplained signal in the DAMA/LIBRA experiments. |
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Published November 3, 2008 At the current time, we cannot tell if Einstein’s cosmological constant—or some other theory—is the correct description for dark energy in the Universe. A proposed measure based on existing data may help us to better distinguish these ideas. |
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Physics 1, 31 (2008) – Published October 20, 2008 The universe we see today is the result of mass-energy fluctuations during the rapid inflationary expansion that followed the big bang. A new approach to analyzing those fluctuations brings theory into better alignment with observational data. |
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